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Author SHA1 Message Date
Linus Torvalds
4d38b88fd1 printk changes for 6.19 
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Merge tag 'printk-for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Allow creaing nbcon console drivers with an unsafe write_atomic()
   callback that can only be called by the final nbcon_atomic_flush_unsafe().
   Otherwise, the driver would rely on the kthread.

   It is going to be used as the-best-effort approach for an
   experimental nbcon netconsole driver, see

     https://lore.kernel.org/r/20251121-nbcon-v1-2-503d17b2b4af@debian.org

   Note that a safe .write_atomic() callback is supposed to work in NMI
   context. But some networking drivers are not safe even in IRQ
   context:

     https://lore.kernel.org/r/oc46gdpmmlly5o44obvmoatfqo5bhpgv7pabpvb6sjuqioymcg@gjsma3ghoz35

   In an ideal world, all networking drivers would be fixed first and
   the atomic flush would be blocked only in NMI context. But it brings
   the question how reliable networking drivers are when the system is
   in a bad state. They might block flushing more reliable serial
   consoles which are more suitable for serious debugging anyway.

 - Allow to use the last 4 bytes of the printk ring buffer.

 - Prevent queuing IRQ work and block printk kthreads when consoles are
   suspended. Otherwise, they create non-necessary churn or even block
   the suspend.

 - Release console_lock() between each record in the kthread used for
   legacy consoles on RT. It might significantly speed up the boot.

 - Release nbcon context between each record in the atomic flush. It
   prevents stalls of the related printk kthread after it has lost the
   ownership in the middle of a record

 - Add support for NBCON consoles into KDB

 - Add %ptsP modifier for printing struct timespec64 and use it where
   possible

 - Misc code clean up

* tag 'printk-for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: (48 commits)
  printk: Use console_is_usable on console_unblank
  arch: um: kmsg_dump: Use console_is_usable
  drivers: serial: kgdboc: Drop checks for CON_ENABLED and CON_BOOT
  lib/vsprintf: Unify FORMAT_STATE_NUM handlers
  printk: Avoid irq_work for printk_deferred() on suspend
  printk: Avoid scheduling irq_work on suspend
  printk: Allow printk_trigger_flush() to flush all types
  tracing: Switch to use %ptSp
  scsi: snic: Switch to use %ptSp
  scsi: fnic: Switch to use %ptSp
  s390/dasd: Switch to use %ptSp
  ptp: ocp: Switch to use %ptSp
  pps: Switch to use %ptSp
  PCI: epf-test: Switch to use %ptSp
  net: dsa: sja1105: Switch to use %ptSp
  mmc: mmc_test: Switch to use %ptSp
  media: av7110: Switch to use %ptSp
  ipmi: Switch to use %ptSp
  igb: Switch to use %ptSp
  e1000e: Switch to use %ptSp
  ...
 2025-12-03 12:42:36 -08:00
Pratyush Yadav
15fc11bb2c docs: add documentation for memfd preservation via LUO 
Add the documentation under the "Preserving file descriptors" section of
LUO's documentation.

Link: https://lkml.kernel.org/r/20251125165850.3389713-16-pasha.tatashin@soleen.com
Signed-off-by: Pratyush Yadav <ptyadav@amazon.de>
Co-developed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Tested-by: David Matlack <dmatlack@google.com>
Cc: Aleksander Lobakin <aleksander.lobakin@intel.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andriy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: anish kumar <yesanishhere@gmail.com>
Cc: Anna Schumaker <anna.schumaker@oracle.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Chen Ridong <chenridong@huawei.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Daniel Wagner <wagi@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Jeffery <djeffery@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guixin Liu <kanie@linux.alibaba.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joanthan Cameron <Jonathan.Cameron@huawei.com>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Leon Romanovsky <leonro@nvidia.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Myugnjoo Ham <myungjoo.ham@samsung.com>
Cc: Parav Pandit <parav@nvidia.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Saeed Mahameed <saeedm@nvidia.com>
Cc: Samiullah Khawaja <skhawaja@google.com>
Cc: Song Liu <song@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Stuart Hayes <stuart.w.hayes@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: William Tu <witu@nvidia.com>
Cc: Yoann Congal <yoann.congal@smile.fr>
Cc: Zhu Yanjun <yanjun.zhu@linux.dev>
Cc: Zijun Hu <quic_zijuhu@quicinc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-11-27 14:24:41 -08:00
Pasha Tatashin
906a330624 docs: add luo documentation 
Add the documentation files for the Live Update Orchestrator

Link: https://lkml.kernel.org/r/20251125165850.3389713-9-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Tested-by: David Matlack <dmatlack@google.com>
Cc: Aleksander Lobakin <aleksander.lobakin@intel.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andriy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: anish kumar <yesanishhere@gmail.com>
Cc: Anna Schumaker <anna.schumaker@oracle.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Chen Ridong <chenridong@huawei.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Daniel Wagner <wagi@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Jeffery <djeffery@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guixin Liu <kanie@linux.alibaba.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joanthan Cameron <Jonathan.Cameron@huawei.com>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Leon Romanovsky <leonro@nvidia.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Myugnjoo Ham <myungjoo.ham@samsung.com>
Cc: Parav Pandit <parav@nvidia.com>
Cc: Pratyush Yadav <ptyadav@amazon.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Saeed Mahameed <saeedm@nvidia.com>
Cc: Samiullah Khawaja <skhawaja@google.com>
Cc: Song Liu <song@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Stuart Hayes <stuart.w.hayes@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: William Tu <witu@nvidia.com>
Cc: Yoann Congal <yoann.congal@smile.fr>
Cc: Zhu Yanjun <yanjun.zhu@linux.dev>
Cc: Zijun Hu <quic_zijuhu@quicinc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-11-27 14:24:39 -08:00
Pasha Tatashin
48a1b2321d liveupdate: kho: move to kernel/liveupdate 
Move KHO to kernel/liveupdate/ in preparation of placing all Live Update
core kernel related files to the same place.

[pasha.tatashin@soleen.com: disable the menu when DEFERRED_STRUCT_PAGE_INIT]
  Link: https://lkml.kernel.org/r/CA+CK2bAvh9Oa2SLfsbJ8zztpEjrgr_hr-uGgF1coy8yoibT39A@mail.gmail.com
Link: https://lkml.kernel.org/r/20251101142325.1326536-8-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-11-27 14:24:33 -08:00
Andy Shevchenko
bccd593744 lib/vsprintf: Add specifier for printing struct timespec64 
A handful drivers want to print a content of the struct timespec64
in a format of %lld:%09ld. In order to make their lives easier, add
the respecting specifier directly to the printf() implementation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://patch.msgid.link/20251113150217.3030010-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
 2025-11-19 10:24:13 +01:00
Bagas Sanjaya
22605d257b Documentation: assoc_array: Format internal tree layout tables 
Format tables in "Basic internal tree layout" as reST tables.

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251013095630.34235-4-bagasdotme@gmail.com>
 2025-10-17 14:23:04 -06:00
Bagas Sanjaya
54ff675c2b Documentation: assoc_array: Indent function explanation text 
Paragraphs of function explanation are currently not indented following
their appropriate numbered list item, which causes only the first
paragraph and function prototype code blocks to be indented in the
numbered list in htmldocs output.

Indent the explanation.

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251013095630.34235-3-bagasdotme@gmail.com>
 2025-10-17 14:23:04 -06:00
Linus Torvalds
a498d59c46 dma-mapping updates for Linux 6.18: 
- refactoring of DMA mapping API to physical addresses as the primary
 interface instead of page+offset parameters; this gets much closer to
 Matthew Wilcox's long term wish for struct-pageless IO to cacheable DRAM and is
 supporting memdesc project which seeks to substantially transform how
 struct page works; an advantage of this approach is the possibility of
 introducing DMA_ATTR_MMIO, which covers existing 'dma_map_resource' flow
 in the common paths, what in turn lets to use recently introduced
 dma_iova_link() API to map PCI P2P MMIO without creating struct page;
 developped by Leon Romanovsky and Jason Gunthorpe
 - minor clean-up by Petr Tesarik and Qianfeng Rong
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Merge tag 'dma-mapping-6.18-2025-09-30' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux

Pull dma-mapping updates from Marek Szyprowski:

 - Refactoring of DMA mapping API to physical addresses as the primary
   interface instead of page+offset parameters

   This gets much closer to Matthew Wilcox's long term wish for
   struct-pageless IO to cacheable DRAM and is supporting memdesc
   project which seeks to substantially transform how struct page works.

   An advantage of this approach is the possibility of introducing
   DMA_ATTR_MMIO, which covers existing 'dma_map_resource' flow in the
   common paths, what in turn lets to use recently introduced
   dma_iova_link() API to map PCI P2P MMIO without creating struct page

   Developped by Leon Romanovsky and Jason Gunthorpe

 - Minor clean-up by Petr Tesarik and Qianfeng Rong

* tag 'dma-mapping-6.18-2025-09-30' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux:
  kmsan: fix missed kmsan_handle_dma() signature conversion
  mm/hmm: properly take MMIO path
  mm/hmm: migrate to physical address-based DMA mapping API
  dma-mapping: export new dma_*map_phys() interface
  xen: swiotlb: Open code map_resource callback
  dma-mapping: implement DMA_ATTR_MMIO for dma_(un)map_page_attrs()
  kmsan: convert kmsan_handle_dma to use physical addresses
  dma-mapping: convert dma_direct_*map_page to be phys_addr_t based
  iommu/dma: implement DMA_ATTR_MMIO for iommu_dma_(un)map_phys()
  iommu/dma: rename iommu_dma_*map_page to iommu_dma_*map_phys
  dma-mapping: rename trace_dma_*map_page to trace_dma_*map_phys
  dma-debug: refactor to use physical addresses for page mapping
  iommu/dma: implement DMA_ATTR_MMIO for dma_iova_link().
  dma-mapping: introduce new DMA attribute to indicate MMIO memory
  swiotlb: Remove redundant __GFP_NOWARN
  dma-direct: clean up the logic in __dma_direct_alloc_pages()
 2025-10-03 17:41:12 -07:00
Linus Torvalds
ee2fe81cdc It has been a relatively busy cycle in docsland, with changes all over: 
- Bring the kernel memory-model docs into the Sphinx build in the "literal
   include" mode.
 
 - Lots of build-infrastructure work, further cleaning up long-term
   kernel-doc technical debt.  The sphinx-pre-install tool has been
   converted to Python and updated for current systems.
 
 - A new tool to detect when documents have been moved and generate HTML
   redirects; this can be used on kernel.org (or any other site hosting the
   rendered docs) to avoid breaking links.
 
 - Automated processing of the YAML files describing the netlink protocol.
 
 - A significant update of the maintainer's PGP guide.
 
 ...and a seemingly endless series of typo fixes, build-problem fixes, etc.
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Merge tag 'docs-6.18' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "It has been a relatively busy cycle in docsland, with changes all
  over:

   - Bring the kernel memory-model docs into the Sphinx build in the
     "literal include" mode.

   - Lots of build-infrastructure work, further cleaning up long-term
     kernel-doc technical debt. The sphinx-pre-install tool has been
     converted to Python and updated for current systems.

   - A new tool to detect when documents have been moved and generate
     HTML redirects; this can be used on kernel.org (or any other site
     hosting the rendered docs) to avoid breaking links.

   - Automated processing of the YAML files describing the netlink
     protocol.

   - A significant update of the maintainer's PGP guide.

  ... and a seemingly endless series of typo fixes, build-problem fixes,
  etc"

* tag 'docs-6.18' of git://git.lwn.net/linux: (193 commits)
  Documentation/features: Update feature lists for 6.17-rc7
  docs: remove cdomain.py
  Documentation/process: submitting-patches: fix typo in "were do"
  docs: dev-tools/lkmm: Fix typo of missing file extension
  Documentation: trace: histogram: Convert ftrace docs cross-reference
  Documentation: trace: histogram-design: Wrap introductory note in note:: directive
  Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram
  Documentation: trace: histogram-design: Trim trailing vertices in diagram explanation text
  Documentation: trace: histogram: Fix histogram trigger subsection number order
  docs: driver-api: fix spelling of "buses".
  Documentation: fbcon: Use admonition directives
  Documentation: fbcon: Reindent 8th step of attach/detach/unload
  Documentation: fbcon: Add boot options and attach/detach/unload section headings
  docs: filesystems: sysfs: add remaining top level sysfs directory descriptions
  docs: filesystems: sysfs: clarify symlink destinations in dev and bus/devices descriptions
  docs: filesystems: sysfs: remove top level sysfs net directory
  docs: maintainer: Fix ambiguous subheading formatting
  docs: kdoc: a few more dump_typedef() tweaks
  docs: kdoc: remove redundant comment stripping in dump_typedef()
  docs: kdoc: remove some dead code in dump_typedef()
  ...
 2025-10-03 17:16:13 -07:00
Johannes Weiner
2ccd9fecd9 mm: remove unused zpool layer 
With zswap using zsmalloc directly, there are no more in-tree users of
this code.  Remove it.

With zpool gone, zsmalloc is now always a simple dependency and no
longer something the user needs to configure. Hide CONFIG_ZSMALLOC
from the user and have zswap and zram pull it in as needed.

Link: https://lkml.kernel.org/r/20250829162212.208258-3-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: SeongJae Park <sj@kernel.org>
Acked-by: Yosry Ahmed <yosry.ahmed@linux.dev> 
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-09-21 14:21:59 -07:00
Leon Romanovsky
e9e81d86fe dma-debug: refactor to use physical addresses for page mapping 
Convert the DMA debug infrastructure from page-based to physical address-based
mapping as a preparation to rely on physical address for DMA mapping routines.

The refactoring renames debug_dma_map_page() to debug_dma_map_phys() and
changes its signature to accept a phys_addr_t parameter instead of struct page
and offset. Similarly, debug_dma_unmap_page() becomes debug_dma_unmap_phys().
A new dma_debug_phy type is introduced to distinguish physical address mappings
from other debug entry types. All callers throughout the codebase are updated
to pass physical addresses directly, eliminating the need for page-to-physical
conversion in the debug layer.

This refactoring eliminates the need to convert between page pointers and
physical addresses in the debug layer, making the code more efficient and
consistent with the DMA mapping API's physical address focus.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
[mszyprow: added a fixup]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/56d1a6769b68dfcbf8b26a75a7329aeb8e3c3b6a.1757423202.git.leonro@nvidia.com
Link: https://lore.kernel.org/all/20250910052618.GH341237@unreal/
 2025-09-12 00:09:51 +02:00
Leon Romanovsky
eadaa8b255 dma-mapping: introduce new DMA attribute to indicate MMIO memory 
This patch introduces the DMA_ATTR_MMIO attribute to mark DMA buffers
that reside in memory-mapped I/O (MMIO) regions, such as device BARs
exposed through the host bridge, which are accessible for peer-to-peer
(P2P) DMA.

This attribute is especially useful for exporting device memory to other
devices for DMA without CPU involvement, and avoids unnecessary or
potentially detrimental CPU cache maintenance calls.

DMA_ATTR_MMIO is supposed to provide dma_map_resource() functionality
without need to call to special function and perform branching when
processing generic containers like bio_vec by the callers.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/6f058ec395c5348014860dbc2eed348c17975843.1757423202.git.leonro@nvidia.com
 2025-09-12 00:08:07 +02:00
Sebastian Andrzej Siewior
f51fe3b7e4 Documentation: Add real-time to core-api 
The documents explain the design concepts behind PREEMPT_RT and highlight key
differences necessary to achieve it.
It also include a list of requirements that must be fulfilled to support
PREEMPT_RT on a given architecture.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[jc: tweaked "how they differ" section head]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250815093858.930751-4-bigeasy@linutronix.de
 2025-08-21 14:06:08 -06:00
Jonathan Corbet
4e18a0b090 Merge branch 'bjorn' into docs-mw 
A big set of typo fixes from Bjorn Helgaas
 2025-08-18 10:40:16 -06:00
Bjorn Helgaas
8900f9ad90 Documentation: Fix core-api typos 
Fix typos.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250813200526.290420-5-helgaas@kernel.org
 2025-08-18 10:31:19 -06:00
Gopi Krishna Menon
0e6bb68887 docs: folio_queue: Fix minor typo in folio_queue page 
Specifically, fix typo 'hese'-> 'these'

Signed-off-by: Gopi Krishna Menon <krishnagopi487@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250810235346.4153-1-krishnagopi487@gmail.com
 2025-08-12 12:40:15 -06:00
Geert Uytterhoeven
119996c9a4 Documentation/printf: Use literal fwnode_handle 
When looking for fwnode_handle in the printk format documentation, it is
only found in the Chinese translation:

    $ git grep fwnode_handle -- Documentation/*printk-formats.rst
    Documentation/translations/zh_CN/core-api/printk-formats.rst:用于打印fwnode_handles的消息。默认情况下是打印完整的节点名称，包括路径。

This happens because the original documentation talks about "fwnode
handles", without mentioning the actual type name.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Kunwu Chan <kunwu.chan@linux.dev>
Reviewed-by: Kunwu Chan <kunwu.chan@linux.dev>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Fixes: 3bd32d6a2e ("lib/vsprintf: Add %pfw conversion specifier for printing fwnode names")
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/07262c55e82fc4a3e3dbe7c45713b14955271e7f.1754552156.git.geert+renesas@glider.be
 2025-08-11 11:00:06 -06:00
Vlastimil Babka
6d3c3ca4c7
module: Rename EXPORT_SYMBOL_GPL_FOR_MODULES to EXPORT_SYMBOL_FOR_MODULES 
Christoph suggested that the explicit _GPL_ can be dropped from the
module namespace export macro, as it's intended for in-tree modules
only. It would be possible to restrict it technically, but it was
pointed out [2] that some cases of using an out-of-tree build of an
in-tree module with the same name are legitimate. But in that case those
also have to be GPL anyway so it's unnecessary to spell it out in the
macro name.

Link: https://lore.kernel.org/all/aFleJN_fE-RbSoFD@infradead.org/ [1]
Link: https://lore.kernel.org/all/CAK7LNATRkZHwJGpojCnvdiaoDnP%2BaeUXgdey5sb_8muzdWTMkA@mail.gmail.com/ [2]
Suggested-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Shivank Garg <shivankg@amd.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Nicolas Schier <n.schier@avm.de>
Reviewed-by: Daniel Gomez <da.gomez@samsung.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/20250808-export_modules-v4-1-426945bcc5e1@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2025-08-11 16:16:36 +02:00
Linus Torvalds
da23ea194d Significant patch series in this pull request: 
- The 4 patch series "mseal cleanups" from Lorenzo Stoakes erforms some
   mseal cleaning with no intended functional change.
 
 - The 3 patch series "Optimizations for khugepaged" from David
   Hildenbrand improves khugepaged throughput by batching PTE operations
   for large folios.  This gain is mainly for arm64.
 
 - The 8 patch series "x86: enable EXECMEM_ROX_CACHE for ftrace and
   kprobes" from Mike Rapoport provides a bugfix, additional debug code and
   cleanups to the execmem code.
 
 - The 7 patch series "mm/shmem, swap: bugfix and improvement of mTHP
   swap in" from Kairui Song provides bugfixes, cleanups and performance
   improvememnts to the mTHP swapin code.
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Merge tag 'mm-stable-2025-08-03-12-35' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull more MM updates from Andrew Morton:
 "Significant patch series in this pull request:

   - "mseal cleanups" (Lorenzo Stoakes)

     Some mseal cleaning with no intended functional change.

   - "Optimizations for khugepaged" (David Hildenbrand)

     Improve khugepaged throughput by batching PTE operations for large
     folios. This gain is mainly for arm64.

   - "x86: enable EXECMEM_ROX_CACHE for ftrace and kprobes" (Mike Rapoport)

     A bugfix, additional debug code and cleanups to the execmem code.

   - "mm/shmem, swap: bugfix and improvement of mTHP swap in" (Kairui Song)

     Bugfixes, cleanups and performance improvememnts to the mTHP swapin
     code"

* tag 'mm-stable-2025-08-03-12-35' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (38 commits)
  mm: mempool: fix crash in mempool_free() for zero-minimum pools
  mm: correct type for vmalloc vm_flags fields
  mm/shmem, swap: fix major fault counting
  mm/shmem, swap: rework swap entry and index calculation for large swapin
  mm/shmem, swap: simplify swapin path and result handling
  mm/shmem, swap: never use swap cache and readahead for SWP_SYNCHRONOUS_IO
  mm/shmem, swap: tidy up swap entry splitting
  mm/shmem, swap: tidy up THP swapin checks
  mm/shmem, swap: avoid redundant Xarray lookup during swapin
  x86/ftrace: enable EXECMEM_ROX_CACHE for ftrace allocations
  x86/kprobes: enable EXECMEM_ROX_CACHE for kprobes allocations
  execmem: drop writable parameter from execmem_fill_trapping_insns()
  execmem: add fallback for failures in vmalloc(VM_ALLOW_HUGE_VMAP)
  execmem: move execmem_force_rw() and execmem_restore_rox() before use
  execmem: rework execmem_cache_free()
  execmem: introduce execmem_alloc_rw()
  execmem: drop unused execmem_update_copy()
  mm: fix a UAF when vma->mm is freed after vma->vm_refcnt got dropped
  mm/rmap: add anon_vma lifetime debug check
  mm: remove mm/io-mapping.c
  ...
 2025-08-05 16:02:07 +03:00
Lorenzo Stoakes
9a4f90e246 mm: remove mm/io-mapping.c 
This is dead code, which was used from commit b739f125e4 ("i915: use
io_mapping_map_user") but reverted a month later by commit 0e4fe0c9f2
("Revert "i915: use io_mapping_map_user"") back in 2021.

Since then nobody has used it, so remove it.

[akpm@linux-foundation.org: update Documentation/core-api/mm-api.rst, per Vlastimil]
Link: https://lkml.kernel.org/r/20250725142901.81502-1-lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-08-02 12:06:10 -07:00
Linus Torvalds
af5b2619a8 workqueue: Changes for v6.17 
- Prepare for defaulting to unbound workqueue. A separate branch was created
   to ease pulling in from other trees but none of the conversions have
   landed yet.
 
 - Memory allocation profiling support added.
 
 - Misc changes.
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Merge tag 'wq-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue updates from Tejun Heo:

 - Prepare for defaulting to unbound workqueue. A separate branch was
   created to ease pulling in from other trees but none of the
   conversions have landed yet

 - Memory allocation profiling support added

 - Misc changes

* tag 'wq-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Use atomic_try_cmpxchg_relaxed() in tryinc_node_nr_active()
  workqueue: Remove unused work_on_cpu_safe
  workqueue: Add new WQ_PERCPU flag
  workqueue: Add system_percpu_wq and system_dfl_wq
  workqueue: Basic memory allocation profiling support
  workqueue: fix opencoded cpumask_next_and_wrap() in wq_select_unbound_cpu()
 2025-07-31 15:40:22 -07:00
Linus Torvalds
beace86e61 Summary of significant series in this pull request: 
- The 4 patch series "mm: ksm: prevent KSM from breaking merging of new
   VMAs" from Lorenzo Stoakes addresses an issue with KSM's
   PR_SET_MEMORY_MERGE mode: newly mapped VMAs were not eligible for
   merging with existing adjacent VMAs.
 
 - The 4 patch series "mm/damon: introduce DAMON_STAT for simple and
   practical access monitoring" from SeongJae Park adds a new kernel module
   which simplifies the setup and usage of DAMON in production
   environments.
 
 - The 6 patch series "stop passing a writeback_control to swap/shmem
   writeout" from Christoph Hellwig is a cleanup to the writeback code
   which removes a couple of pointers from struct writeback_control.
 
 - The 7 patch series "drivers/base/node.c: optimization and cleanups"
   from Donet Tom contains largely uncorrelated cleanups to the NUMA node
   setup and management code.
 
 - The 4 patch series "mm: userfaultfd: assorted fixes and cleanups" from
   Tal Zussman does some maintenance work on the userfaultfd code.
 
 - The 5 patch series "Readahead tweaks for larger folios" from Ryan
   Roberts implements some tuneups for pagecache readahead when it is
   reading into order>0 folios.
 
 - The 4 patch series "selftests/mm: Tweaks to the cow test" from Mark
   Brown provides some cleanups and consistency improvements to the
   selftests code.
 
 - The 4 patch series "Optimize mremap() for large folios" from Dev Jain
   does that.  A 37% reduction in execution time was measured in a
   memset+mremap+munmap microbenchmark.
 
 - The 5 patch series "Remove zero_user()" from Matthew Wilcox expunges
   zero_user() in favor of the more modern memzero_page().
 
 - The 3 patch series "mm/huge_memory: vmf_insert_folio_*() and
   vmf_insert_pfn_pud() fixes" from David Hildenbrand addresses some warts
   which David noticed in the huge page code.  These were not known to be
   causing any issues at this time.
 
 - The 3 patch series "mm/damon: use alloc_migrate_target() for
   DAMOS_MIGRATE_{HOT,COLD" from SeongJae Park provides some cleanup and
   consolidation work in DAMON.
 
 - The 3 patch series "use vm_flags_t consistently" from Lorenzo Stoakes
   uses vm_flags_t in places where we were inappropriately using other
   types.
 
 - The 3 patch series "mm/memfd: Reserve hugetlb folios before
   allocation" from Vivek Kasireddy increases the reliability of large page
   allocation in the memfd code.
 
 - The 14 patch series "mm: Remove pXX_devmap page table bit and pfn_t
   type" from Alistair Popple removes several now-unneeded PFN_* flags.
 
 - The 5 patch series "mm/damon: decouple sysfs from core" from SeongJae
   Park implememnts some cleanup and maintainability work in the DAMON
   sysfs layer.
 
 - The 5 patch series "madvise cleanup" from Lorenzo Stoakes does quite a
   lot of cleanup/maintenance work in the madvise() code.
 
 - The 4 patch series "madvise anon_name cleanups" from Vlastimil Babka
   provides additional cleanups on top or Lorenzo's effort.
 
 - The 11 patch series "Implement numa node notifier" from Oscar Salvador
   creates a standalone notifier for NUMA node memory state changes.
   Previously these were lumped under the more general memory on/offline
   notifier.
 
 - The 6 patch series "Make MIGRATE_ISOLATE a standalone bit" from Zi Yan
   cleans up the pageblock isolation code and fixes a potential issue which
   doesn't seem to cause any problems in practice.
 
 - The 5 patch series "selftests/damon: add python and drgn based DAMON
   sysfs functionality tests" from SeongJae Park adds additional drgn- and
   python-based DAMON selftests which are more comprehensive than the
   existing selftest suite.
 
 - The 5 patch series "Misc rework on hugetlb faulting path" from Oscar
   Salvador fixes a rather obscure deadlock in the hugetlb fault code and
   follows that fix with a series of cleanups.
 
 - The 3 patch series "cma: factor out allocation logic from
   __cma_declare_contiguous_nid" from Mike Rapoport rationalizes and cleans
   up the highmem-specific code in the CMA allocator.
 
 - The 28 patch series "mm/migration: rework movable_ops page migration
   (part 1)" from David Hildenbrand provides cleanups and
   future-preparedness to the migration code.
 
 - The 2 patch series "mm/damon: add trace events for auto-tuned
   monitoring intervals and DAMOS quota" from SeongJae Park adds some
   tracepoints to some DAMON auto-tuning code.
 
 - The 6 patch series "mm/damon: fix misc bugs in DAMON modules" from
   SeongJae Park does that.
 
 - The 6 patch series "mm/damon: misc cleanups" from SeongJae Park also
   does what it claims.
 
 - The 4 patch series "mm: folio_pte_batch() improvements" from David
   Hildenbrand cleans up the large folio PTE batching code.
 
 - The 13 patch series "mm/damon/vaddr: Allow interleaving in
   migrate_{hot,cold} actions" from SeongJae Park facilitates dynamic
   alteration of DAMON's inter-node allocation policy.
 
 - The 3 patch series "Remove unmap_and_put_page()" from Vishal Moola
   provides a couple of page->folio conversions.
 
 - The 4 patch series "mm: per-node proactive reclaim" from Davidlohr
   Bueso implements a per-node control of proactive reclaim - beyond the
   current memcg-based implementation.
 
 - The 14 patch series "mm/damon: remove damon_callback" from SeongJae
   Park replaces the damon_callback interface with a more general and
   powerful damon_call()+damos_walk() interface.
 
 - The 10 patch series "mm/mremap: permit mremap() move of multiple VMAs"
   from Lorenzo Stoakes implements a number of mremap cleanups (of course)
   in preparation for adding new mremap() functionality: newly permit the
   remapping of multiple VMAs when the user is specifying MREMAP_FIXED.  It
   still excludes some specialized situations where this cannot be
   performed reliably.
 
 - The 3 patch series "drop hugetlb_free_pgd_range()" from Anthony Yznaga
   switches some sparc hugetlb code over to the generic version and removes
   the thus-unneeded hugetlb_free_pgd_range().
 
 - The 4 patch series "mm/damon/sysfs: support periodic and automated
   stats update" from SeongJae Park augments the present
   userspace-requested update of DAMON sysfs monitoring files.  Automatic
   update is now provided, along with a tunable to control the update
   interval.
 
 - The 4 patch series "Some randome fixes and cleanups to swapfile" from
   Kemeng Shi does what is claims.
 
 - The 4 patch series "mm: introduce snapshot_page" from Luiz Capitulino
   and David Hildenbrand provides (and uses) a means by which debug-style
   functions can grab a copy of a pageframe and inspect it locklessly
   without tripping over the races inherent in operating on the live
   pageframe directly.
 
 - The 6 patch series "use per-vma locks for /proc/pid/maps reads" from
   Suren Baghdasaryan addresses the large contention issues which can be
   triggered by reads from that procfs file.  Latencies are reduced by more
   than half in some situations.  The series also introduces several new
   selftests for the /proc/pid/maps interface.
 
 - The 6 patch series "__folio_split() clean up" from Zi Yan cleans up
   __folio_split()!
 
 - The 7 patch series "Optimize mprotect() for large folios" from Dev
   Jain provides some quite large (>3x) speedups to mprotect() when dealing
   with large folios.
 
 - The 2 patch series "selftests/mm: reuse FORCE_READ to replace "asm
   volatile("" : "+r" (XXX));" and some cleanup" from wang lian does some
   cleanup work in the selftests code.
 
 - The 3 patch series "tools/testing: expand mremap testing" from Lorenzo
   Stoakes extends the mremap() selftest in several ways, including adding
   more checking of Lorenzo's recently added "permit mremap() move of
   multiple VMAs" feature.
 
 - The 22 patch series "selftests/damon/sysfs.py: test all parameters"
   from SeongJae Park extends the DAMON sysfs interface selftest so that it
   tests all possible user-requested parameters.  Rather than the present
   minimal subset.
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Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:
 "As usual, many cleanups. The below blurbiage describes 42 patchsets.
  21 of those are partially or fully cleanup work. "cleans up",
  "cleanup", "maintainability", "rationalizes", etc.

  I never knew the MM code was so dirty.

  "mm: ksm: prevent KSM from breaking merging of new VMAs" (Lorenzo Stoakes)
     addresses an issue with KSM's PR_SET_MEMORY_MERGE mode: newly
     mapped VMAs were not eligible for merging with existing adjacent
     VMAs.

  "mm/damon: introduce DAMON_STAT for simple and practical access monitoring" (SeongJae Park)
     adds a new kernel module which simplifies the setup and usage of
     DAMON in production environments.

  "stop passing a writeback_control to swap/shmem writeout" (Christoph Hellwig)
     is a cleanup to the writeback code which removes a couple of
     pointers from struct writeback_control.

  "drivers/base/node.c: optimization and cleanups" (Donet Tom)
     contains largely uncorrelated cleanups to the NUMA node setup and
     management code.

  "mm: userfaultfd: assorted fixes and cleanups" (Tal Zussman)
     does some maintenance work on the userfaultfd code.

  "Readahead tweaks for larger folios" (Ryan Roberts)
     implements some tuneups for pagecache readahead when it is reading
     into order>0 folios.

  "selftests/mm: Tweaks to the cow test" (Mark Brown)
     provides some cleanups and consistency improvements to the
     selftests code.

  "Optimize mremap() for large folios" (Dev Jain)
     does that. A 37% reduction in execution time was measured in a
     memset+mremap+munmap microbenchmark.

  "Remove zero_user()" (Matthew Wilcox)
     expunges zero_user() in favor of the more modern memzero_page().

  "mm/huge_memory: vmf_insert_folio_*() and vmf_insert_pfn_pud() fixes" (David Hildenbrand)
     addresses some warts which David noticed in the huge page code.
     These were not known to be causing any issues at this time.

  "mm/damon: use alloc_migrate_target() for DAMOS_MIGRATE_{HOT,COLD" (SeongJae Park)
     provides some cleanup and consolidation work in DAMON.

  "use vm_flags_t consistently" (Lorenzo Stoakes)
     uses vm_flags_t in places where we were inappropriately using other
     types.

  "mm/memfd: Reserve hugetlb folios before allocation" (Vivek Kasireddy)
     increases the reliability of large page allocation in the memfd
     code.

  "mm: Remove pXX_devmap page table bit and pfn_t type" (Alistair Popple)
     removes several now-unneeded PFN_* flags.

  "mm/damon: decouple sysfs from core" (SeongJae Park)
     implememnts some cleanup and maintainability work in the DAMON
     sysfs layer.

  "madvise cleanup" (Lorenzo Stoakes)
     does quite a lot of cleanup/maintenance work in the madvise() code.

  "madvise anon_name cleanups" (Vlastimil Babka)
     provides additional cleanups on top or Lorenzo's effort.

  "Implement numa node notifier" (Oscar Salvador)
     creates a standalone notifier for NUMA node memory state changes.
     Previously these were lumped under the more general memory
     on/offline notifier.

  "Make MIGRATE_ISOLATE a standalone bit" (Zi Yan)
     cleans up the pageblock isolation code and fixes a potential issue
     which doesn't seem to cause any problems in practice.

  "selftests/damon: add python and drgn based DAMON sysfs functionality tests" (SeongJae Park)
     adds additional drgn- and python-based DAMON selftests which are
     more comprehensive than the existing selftest suite.

  "Misc rework on hugetlb faulting path" (Oscar Salvador)
     fixes a rather obscure deadlock in the hugetlb fault code and
     follows that fix with a series of cleanups.

  "cma: factor out allocation logic from __cma_declare_contiguous_nid" (Mike Rapoport)
     rationalizes and cleans up the highmem-specific code in the CMA
     allocator.

  "mm/migration: rework movable_ops page migration (part 1)" (David Hildenbrand)
     provides cleanups and future-preparedness to the migration code.

  "mm/damon: add trace events for auto-tuned monitoring intervals and DAMOS quota" (SeongJae Park)
     adds some tracepoints to some DAMON auto-tuning code.

  "mm/damon: fix misc bugs in DAMON modules" (SeongJae Park)
     does that.

  "mm/damon: misc cleanups" (SeongJae Park)
     also does what it claims.

  "mm: folio_pte_batch() improvements" (David Hildenbrand)
     cleans up the large folio PTE batching code.

  "mm/damon/vaddr: Allow interleaving in migrate_{hot,cold} actions" (SeongJae Park)
     facilitates dynamic alteration of DAMON's inter-node allocation
     policy.

  "Remove unmap_and_put_page()" (Vishal Moola)
     provides a couple of page->folio conversions.

  "mm: per-node proactive reclaim" (Davidlohr Bueso)
     implements a per-node control of proactive reclaim - beyond the
     current memcg-based implementation.

  "mm/damon: remove damon_callback" (SeongJae Park)
     replaces the damon_callback interface with a more general and
     powerful damon_call()+damos_walk() interface.

  "mm/mremap: permit mremap() move of multiple VMAs" (Lorenzo Stoakes)
     implements a number of mremap cleanups (of course) in preparation
     for adding new mremap() functionality: newly permit the remapping
     of multiple VMAs when the user is specifying MREMAP_FIXED. It still
     excludes some specialized situations where this cannot be performed
     reliably.

  "drop hugetlb_free_pgd_range()" (Anthony Yznaga)
     switches some sparc hugetlb code over to the generic version and
     removes the thus-unneeded hugetlb_free_pgd_range().

  "mm/damon/sysfs: support periodic and automated stats update" (SeongJae Park)
     augments the present userspace-requested update of DAMON sysfs
     monitoring files. Automatic update is now provided, along with a
     tunable to control the update interval.

  "Some randome fixes and cleanups to swapfile" (Kemeng Shi)
     does what is claims.

  "mm: introduce snapshot_page" (Luiz Capitulino and David Hildenbrand)
     provides (and uses) a means by which debug-style functions can grab
     a copy of a pageframe and inspect it locklessly without tripping
     over the races inherent in operating on the live pageframe
     directly.

  "use per-vma locks for /proc/pid/maps reads" (Suren Baghdasaryan)
     addresses the large contention issues which can be triggered by
     reads from that procfs file. Latencies are reduced by more than
     half in some situations. The series also introduces several new
     selftests for the /proc/pid/maps interface.

  "__folio_split() clean up" (Zi Yan)
     cleans up __folio_split()!

  "Optimize mprotect() for large folios" (Dev Jain)
     provides some quite large (>3x) speedups to mprotect() when dealing
     with large folios.

  "selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));" and some cleanup" (wang lian)
     does some cleanup work in the selftests code.

  "tools/testing: expand mremap testing" (Lorenzo Stoakes)
     extends the mremap() selftest in several ways, including adding
     more checking of Lorenzo's recently added "permit mremap() move of
     multiple VMAs" feature.

  "selftests/damon/sysfs.py: test all parameters" (SeongJae Park)
     extends the DAMON sysfs interface selftest so that it tests all
     possible user-requested parameters. Rather than the present minimal
     subset"

* tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (370 commits)
  MAINTAINERS: add missing headers to mempory policy & migration section
  MAINTAINERS: add missing file to cgroup section
  MAINTAINERS: add MM MISC section, add missing files to MISC and CORE
  MAINTAINERS: add missing zsmalloc file
  MAINTAINERS: add missing files to page alloc section
  MAINTAINERS: add missing shrinker files
  MAINTAINERS: move memremap.[ch] to hotplug section
  MAINTAINERS: add missing mm_slot.h file THP section
  MAINTAINERS: add missing interval_tree.c to memory mapping section
  MAINTAINERS: add missing percpu-internal.h file to per-cpu section
  mm/page_alloc: remove trace_mm_alloc_contig_migrate_range_info()
  selftests/damon: introduce _common.sh to host shared function
  selftests/damon/sysfs.py: test runtime reduction of DAMON parameters
  selftests/damon/sysfs.py: test non-default parameters runtime commit
  selftests/damon/sysfs.py: generalize DAMON context commit assertion
  selftests/damon/sysfs.py: generalize monitoring attributes commit assertion
  selftests/damon/sysfs.py: generalize DAMOS schemes commit assertion
  selftests/damon/sysfs.py: test DAMOS filters commitment
  selftests/damon/sysfs.py: generalize DAMOS scheme commit assertion
  selftests/damon/sysfs.py: test DAMOS destinations commitment
  ...
 2025-07-31 14:57:54 -07:00
Linus Torvalds
b1cce98493 It has been a relatively busy cycle for docs, especially the build system: 
- The Perl kernel-doc script was added to 2.3.52pre1 just after the turn of
   the millennium.  Over the following 25 years, it accumulated a vast
   amount of cruft, all in a language few people want to deal with anymore.
   Mauro's Python replacement in 6.16 faithfully reproduced all of the cruft
   in the hope of avoiding regressions.  Now that we have a more reasonable
   code base, though, we can work on cleaning it up; many of the changes
   this time around are toward that end.
 
 - A reorganization of the ext4 docs into the usual TOC format.
 
 - Various Chinese translations and updates.
 
 - A new script from Mauro to help with docs-build testing.
 
 - A new document for linked lists
 
 - A sweep through MAINTAINERS fixing broken GitHub git:// repository links.
 
 ...and lots of fixes and updates.
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Merge tag 'docs-6.17' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "It has been a relatively busy cycle for docs, especially the build
  system:

   - The Perl kernel-doc script was added to 2.3.52pre1 just after the
     turn of the millennium. Over the following 25 years, it accumulated
     a vast amount of cruft, all in a language few people want to deal
     with anymore. Mauro's Python replacement in 6.16 faithfully
     reproduced all of the cruft in the hope of avoiding regressions.

     Now that we have a more reasonable code base, though, we can work
     on cleaning it up; many of the changes this time around are toward
     that end.

   - A reorganization of the ext4 docs into the usual TOC format.

   - Various Chinese translations and updates.

   - A new script from Mauro to help with docs-build testing.

   - A new document for linked lists

   - A sweep through MAINTAINERS fixing broken GitHub git:// repository
     links.

  ...and lots of fixes and updates"

* tag 'docs-6.17' of git://git.lwn.net/linux: (147 commits)
  scripts: add origin commit identification based on specific patterns
  sphinx: kernel_abi: fix performance regression with O=<dir>
  Documentation: core-api: entry: Replace deprecated KVM entry/exit functions
  docs: fault-injection: drop reference to md-faulty
  docs: document linked lists
  scripts: kdoc: make it backward-compatible with Python 3.7
  docs: kernel-doc: emit warnings for ancient versions of Python
  Documentation/rtla: Describe exit status
  Documentation/rtla: Add include common_appendix.rst
  docs: kernel: Clarify printk_ratelimit_burst reset behavior
  Documentation: ioctl-number: Don't repeat macro names
  Documentation: ioctl-number: Shorten macros table
  Documentation: ioctl-number: Correct full path to papr-physical-attestation.h
  Documentation: ioctl-number: Extend "Include File" column width
  Documentation: ioctl-number: Fix linuxppc-dev mailto link
  overlayfs.rst: fix typos
  docs: kdoc: emit a warning for ancient versions of Python
  docs: kdoc: clean up check_sections()
  docs: kdoc: directly access the always-there KdocItem fields
  docs: kdoc: straighten up dump_declaration()
  ...
 2025-07-31 08:36:51 -07:00
Andrew Donnellan
3597405eff Documentation: core-api: entry: Replace deprecated KVM entry/exit functions 
The x86-specific functions kvm_guest_{enter,exit}_irqoff() were removed
and replaced by the generic guest_state_{enter,exit}_irqoff() in commit
ef9989afda ("kvm: add guest_state_{enter,exit}_irqoff()") and commit
b2d2af7e5d ("kvm/x86: rework guest entry logic").

Update the references in the entry/exit handling documentation.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Nicolas Saenz Julienne <nsaenz@amazon.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250723075134.105132-1-ajd@linux.ibm.com
 2025-07-24 08:32:59 -06:00
Nicolas Frattaroli
dcaf9d315c docs: document linked lists 
Add example-driven documentation for the kernel's generic linked list
data structure. This includes discussion of situations where linked
lists are likely inappropriate, and references to further reading.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Link: https://lore.kernel.org/r/20250714-linked-list-docs-v3-1-56c461580866@collabora.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2025-07-17 16:55:53 -06:00
Andrew Donnellan
2abdc8818c Documentation: core-api: entry: Fix typo "systcalls" -> "syscalls" 
Fix a typo: "systcalls" should be "syscalls".

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250715061529.56268-1-ajd@linux.ibm.com
 2025-07-15 13:28:50 -06:00
Oscar Salvador
d2a9721d80 mm,memory_hotplug: drop status_change_nid parameter from memory_notify 
There no users left of status_change_nid, so drop it from memory_notify
struct.

Link: https://lkml.kernel.org/r/20250616135158.450136-12-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Suggested-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Harry Yoo <harry.yoo@oracle.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joanthan Cameron <Jonathan.Cameron@huawei.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-07-13 16:38:17 -07:00
Oscar Salvador
67929de108 mm,memory_hotplug: implement numa node notifier 
There are at least six consumers of hotplug_memory_notifier that what they
really are interested in is whether any numa node changed its state, e.g:
going from having memory to not having memory and vice versa.

Implement a specific notifier for numa nodes when their state gets
changed, which will later be used by those consumers that are only
interested in numa node state changes.

Add documentation as well.

[dan.carpenter@linaro.org: set failure reason in offline_pages()]
  Link: https://lkml.kernel.org/r/be4fd31b-7d09-46b0-8329-6d0464ffa7a5@sabinyo.mountain
Link: https://lkml.kernel.org/r/20250616135158.450136-4-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-07-13 16:38:15 -07:00
Oscar Salvador
8d2882a8ed mm,memory_hotplug: remove status_change_nid_normal and update documentation 
Now that the last user of status_change_nid_normal is gone, we can remove
it.  Update documentation accordingly.

Link: https://lkml.kernel.org/r/20250616135158.450136-3-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Harry Yoo <harry.yoo@oracle.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joanthan Cameron <Jonathan.Cameron@huawei.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-07-13 16:38:14 -07:00
Petr Tesarik
f304c25980 docs: dma-api: clean up documentation of dma_map_sg() 
Describe in one sentence what the function does.

Do not repeat example situations when the returned number is lower than
the number of segments on input.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-9-ptesarik@suse.com
 2025-07-01 13:56:05 -06:00
Petr Tesarik
0ebbc69ebc docs: dma-api: update streaming DMA physical address constraints 
Add an introductory paragraph to Part Id - Streaming DMA mappings and move
the explanation of address constraints there, because it applies to all map
functions.

Clarify that streaming DMA can be used with memory which does not meet the
addressing constraints of a device, but it may fail in that case.

Make a note about SWIOTLB and link to the detailed description of it.

Do not mention platform-dependent allocation flags. The note may mislead
device driver authors into thinking that they should poke into and try to
second-guess the DMA API implementation. They definitely shouldn't.

Remove the claim that platforms with an IOMMU may not require physically
contiguous buffers. The current implementation explicitly rejects vmalloc
addresses, regardless of IOMMU.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-8-ptesarik@suse.com
 2025-07-01 13:56:05 -06:00
Petr Tesarik
faa7c7ebd8 docs: dma-api: clarify DMA addressing limitations 
Move the description of DMA mask from the documentation of dma_map_single()
to Part Ic - DMA addressing limitations and improve the wording.

Explain when a mask setting function may fail, and do not repeat this
explanation for each individual function.

Clarify which device parameters are updated by each mask setting function.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-7-ptesarik@suse.com
 2025-07-01 13:56:05 -06:00
Petr Tesarik
61043d0995 docs: dma-api: remove duplicate description of the DMA pool API 
Move the DMA pool API documentation from Memory Management APIs to
dma-api.rst, replacing the outdated duplicate description there.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-6-ptesarik@suse.com
 2025-07-01 13:56:05 -06:00
Petr Tesarik
fc9a099567 docs: dma-api: add a kernel-doc comment for dma_pool_zalloc() 
Document the dma_pool_zalloc() wrapper.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
[jc: fixed up dma_pool_alloc() reference in dmapool.h]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-5-ptesarik@suse.com
 2025-07-01 13:55:37 -06:00
Petr Tesarik
6381b9d940 docs: dma-api: remove remnants of PCI DMA API 
The wording sometimes suggests there are multiple functions for an
operation. This was in fact the case before PCI DMA API was removed, but
since there is only one API now, the documentation has become confusing.

To improve readability:

* Remove implicit references to the PCI DMA API (plurals, use of "both",
  etc.)

* Where possible, refer to an actual function rather than a more generic
  description of the operation.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-4-ptesarik@suse.com
 2025-07-01 13:25:36 -06:00
Petr Tesarik
4d3c6bc11b docs: dma-api: replace consistent with coherent 
For consistency, always use the term "coherent" when talking about memory
that is not subject to CPU caching effects. The term "consistent" is a
relic of a long-removed PCI DMA API (pci_alloc_consistent() and
pci_free_consistent() functions).

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-3-ptesarik@suse.com
 2025-07-01 13:25:36 -06:00
Petr Tesarik
7362b6ba17 docs: dma-api: use "DMA API" consistently throughout the document 
Make sure that all occurrences are spelled "DMA API" (all uppercase, no
hyphen, no underscore).

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627101015.1600042-2-ptesarik@suse.com
 2025-07-01 13:25:36 -06:00
Eric Biggers
9b0236f4ef lib/crc: crc64: Add include/linux/crc64.h to kernel-api.rst 
The other CRC functions with kerneldoc are here, so add crc64.h too.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250619183414.100082-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
 2025-06-30 09:31:57 -07:00
Eric Biggers
8c7c675155 lib/crc: crc32: Document crc32_le(), crc32_be(), and crc32c() 
Document these widely used functions.

Update kernel-api.rst to point to the correct place, instead of to
crc32-main.c which no longer contains kerneldoc comments.

Simplify the documentation in crc32poly.h to just point to the
corresponding functions, now that they are properly documented.  Change
the value of CRC32C_POLY_LE to lower case, for consistency.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250619183414.100082-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
 2025-06-30 09:31:57 -07:00
Eric Biggers
0bcfca5640 lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/ 
Rework how lib/crc/ supports arch-optimized code.  First, instead of the
arch-optimized CRC code being in arch/$(SRCARCH)/lib/, it will now be in
lib/crc/$(SRCARCH)/.  Second, the API functions (e.g. crc32c()),
arch-optimized functions (e.g. crc32c_arch()), and generic functions
(e.g. crc32c_base()) will now be part of a single module for each CRC
type, allowing better inlining and dead code elimination.  The second
change is made possible by the first.

As an example, consider CONFIG_CRC32=m on x86.  We'll now have just
crc32.ko instead of both crc32-x86.ko and crc32.ko.  The two modules
were already coupled together and always both got loaded together via
direct symbol dependency, so the separation provided no benefit.

Note: later I'd like to apply the same design to lib/crypto/ too, where
often the API functions are out-of-line so this will work even better.
In those cases, for each algorithm we currently have 3 modules all
coupled together, e.g. libsha256.ko, libsha256-generic.ko, and
sha256-x86.ko.  We should have just one, inline things properly, and
rely on the compiler's dead code elimination to decide the inclusion of
the generic code instead of manually setting it via kconfig.

Having arch-specific code outside arch/ was somewhat controversial when
Zinc proposed it back in 2018.  But I don't think the concerns are
warranted.  It's better from a technical perspective, as it enables the
improvements mentioned above.  This model is already successfully used
in other places in the kernel such as lib/raid6/.  The community of each
architecture still remains free to work on the code, even if it's not in
arch/.  At the time there was also a desire to put the library code in
the same files as the old-school crypto API, but that was a mistake; now
that the library is separate, that's no longer a constraint either.

Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20250607200454.73587-3-ebiggers@kernel.org
Link: https://lore.kernel.org/r/20250612054514.142728-1-ebiggers@kernel.org
Link: https://lore.kernel.org/r/20250621012221.4351-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
 2025-06-30 09:31:57 -07:00
Eric Biggers
89a5159140 lib/crc: Move files into lib/crc/ 
Move all CRC files in lib/ into a subdirectory lib/crc/ to keep them
from cluttering up the main lib/ directory.

Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20250607200454.73587-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
 2025-06-30 09:31:57 -07:00
Tejun Heo
f11113d013 Merge branch 'WQ_PERCPU' into for-6.17 2025-06-17 08:52:50 -10:00
Marco Crivellari
930c2ea566 workqueue: Add new WQ_PERCPU flag 
Currently if a user enqueue a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.
This lack of consistentcy cannot be addressed without refactoring the API.

This patch adds a new WQ_PERCPU flag to explicitly request the use of
the per-CPU behavior. Both flags coexist for one release cycle to allow
callers to transition their calls.

Once migration is complete, WQ_UNBOUND can be removed and unbound will
become the implicit default.

tj: Merged doc patch.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 2025-06-17 08:52:09 -10:00
Matthew Wilcox (Oracle)
1598878875 doc: Include scatterlist APIs in htmldocs 
We have all this fine kernel-doc written, and it's not published
anywhere.  Expose it to public view.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250604195753.823742-1-willy@infradead.org
 2025-06-09 14:24:29 -06:00
Collin Funk
97d91036a4 docs: packing: Fix a typo in example code. 
Fix misspelling of "typedef".

Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/e532b992a79999d3405a363db4b2bd4504fed592.1749434907.git.collin.funk1@gmail.com
 2025-06-09 12:29:50 -06:00
Linus Torvalds
8630c59e99 Kbuild updates for v6.16 
- Add support for the EXPORT_SYMBOL_GPL_FOR_MODULES() macro, which exports a
    symbol only to specified modules
 
  - Improve ABI handling in gendwarfksyms
 
  - Forcibly link lib-y objects to vmlinux even if CONFIG_MODULES=n
 
  - Add checkers for redundant or missing <linux/export.h> inclusion
 
  - Deprecate the extra-y syntax
 
  - Fix a genksyms bug when including enum constants from *.symref files
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Merge tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Add support for the EXPORT_SYMBOL_GPL_FOR_MODULES() macro, which
   exports a symbol only to specified modules

 - Improve ABI handling in gendwarfksyms

 - Forcibly link lib-y objects to vmlinux even if CONFIG_MODULES=n

 - Add checkers for redundant or missing <linux/export.h> inclusion

 - Deprecate the extra-y syntax

 - Fix a genksyms bug when including enum constants from *.symref files

* tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (28 commits)
  genksyms: Fix enum consts from a reference affecting new values
  arch: use always-$(KBUILD_BUILTIN) for vmlinux.lds
  kbuild: set y instead of 1 to KBUILD_{BUILTIN,MODULES}
  efi/libstub: use 'targets' instead of extra-y in Makefile
  module: make __mod_device_table__* symbols static
  scripts/misc-check: check unnecessary #include <linux/export.h> when W=1
  scripts/misc-check: check missing #include <linux/export.h> when W=1
  scripts/misc-check: add double-quotes to satisfy shellcheck
  kbuild: move W=1 check for scripts/misc-check to top-level Makefile
  scripts/tags.sh: allow to use alternative ctags implementation
  kconfig: introduce menu type enum
  docs: symbol-namespaces: fix reST warning with literal block
  kbuild: link lib-y objects to vmlinux forcibly even when CONFIG_MODULES=n
  tinyconfig: enable CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  docs/core-api/symbol-namespaces: drop table of contents and section numbering
  modpost: check forbidden MODULE_IMPORT_NS("module:") at compile time
  kbuild: move kbuild syntax processing to scripts/Makefile.build
  Makefile: remove dependency on archscripts for header installation
  Documentation/kbuild: Add new gendwarfksyms kABI rules
  Documentation/kbuild: Drop section numbers
  ...
 2025-06-07 10:05:35 -07:00
Khaled Elnaggar
94145ffb07 docs: symbol-namespaces: fix reST warning with literal block 
Use a literal block for the EXPORT_SYMBOL_GPL_FOR_MODULES() example to
avoid a Docutils warning about unmatched '*'. This ensures correct rendering
and keeps the source readable.

Warning:
Documentation/core-api/symbol-namespaces.rst:90: WARNING: Inline emphasis start-string without end-string. [docutils]

Signed-off-by: Khaled Elnaggar <khaledelnaggarlinux@gmail.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
 2025-06-06 05:40:25 +09:00
Linus Torvalds
0fb34422b5 vfs-6.16-rc1.netfs 
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Merge tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull netfs updates from Christian Brauner:

 - The main API document has been extensively updated/rewritten

 - Fix an oops in write-retry due to mis-resetting the I/O iterator

 - Fix the recording of transferred bytes for short DIO reads

 - Fix a request's work item to not require a reference, thereby
   avoiding the need to get rid of it in BH/IRQ context

 - Fix waiting and waking to be consistent about the waitqueue used

 - Remove NETFS_SREQ_SEEK_DATA_READ, NETFS_INVALID_WRITE,
   NETFS_ICTX_WRITETHROUGH, NETFS_READ_HOLE_CLEAR,
   NETFS_RREQ_DONT_UNLOCK_FOLIOS, and NETFS_RREQ_BLOCKED

 - Reorder structs to eliminate holes

 - Remove netfs_io_request::ractl

 - Only provide proc_link field if CONFIG_PROC_FS=y

 - Remove folio_queue::marks3

 - Fix undifferentiation of DIO reads from unbuffered reads

* tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  netfs: Fix undifferentiation of DIO reads from unbuffered reads
  netfs: Fix wait/wake to be consistent about the waitqueue used
  netfs: Fix the request's work item to not require a ref
  netfs: Fix setting of transferred bytes with short DIO reads
  netfs: Fix oops in write-retry from mis-resetting the subreq iterator
  fs/netfs: remove unused flag NETFS_RREQ_BLOCKED
  fs/netfs: remove unused flag NETFS_RREQ_DONT_UNLOCK_FOLIOS
  folio_queue: remove unused field `marks3`
  fs/netfs: declare field `proc_link` only if CONFIG_PROC_FS=y
  fs/netfs: remove `netfs_io_request.ractl`
  fs/netfs: reorder struct fields to eliminate holes
  fs/netfs: remove unused enum choice NETFS_READ_HOLE_CLEAR
  fs/netfs: remove unused flag NETFS_ICTX_WRITETHROUGH
  fs/netfs: remove unused source NETFS_INVALID_WRITE
  fs/netfs: remove unused flag NETFS_SREQ_SEEK_DATA_READ
 2025-06-02 15:04:06 -07:00
Linus Torvalds
00c010e130 - The 11 patch series "Add folio_mk_pte()" from Matthew Wilcox 
simplifies the act of creating a pte which addresses the first page in a
   folio and reduces the amount of plumbing which architecture must
   implement to provide this.
 
 - The 8 patch series "Misc folio patches for 6.16" from Matthew Wilcox
   is a shower of largely unrelated folio infrastructure changes which
   clean things up and better prepare us for future work.
 
 - The 3 patch series "memory,x86,acpi: hotplug memory alignment
   advisement" from Gregory Price adds early-init code to prevent x86 from
   leaving physical memory unused when physical address regions are not
   aligned to memory block size.
 
 - The 2 patch series "mm/compaction: allow more aggressive proactive
   compaction" from Michal Clapinski provides some tuning of the (sadly,
   hard-coded (more sadly, not auto-tuned)) thresholds for our invokation
   of proactive compaction.  In a simple test case, the reduction of a guest
   VM's memory consumption was dramatic.
 
 - The 8 patch series "Minor cleanups and improvements to swap freeing
   code" from Kemeng Shi provides some code cleaups and a small efficiency
   improvement to this part of our swap handling code.
 
 - The 6 patch series "ptrace: introduce PTRACE_SET_SYSCALL_INFO API"
   from Dmitry Levin adds the ability for a ptracer to modify syscalls
   arguments.  At this time we can alter only "system call information that
   are used by strace system call tampering, namely, syscall number,
   syscall arguments, and syscall return value.
 
   This series should have been incorporated into mm.git's "non-MM"
   branch, but I goofed.
 
 - The 3 patch series "fs/proc: extend the PAGEMAP_SCAN ioctl to report
   guard regions" from Andrei Vagin extends the info returned by the
   PAGEMAP_SCAN ioctl against /proc/pid/pagemap.  This permits CRIU to more
   efficiently get at the info about guard regions.
 
 - The 2 patch series "Fix parameter passed to page_mapcount_is_type()"
   from Gavin Shan implements that fix.  No runtime effect is expected
   because validate_page_before_insert() happens to fix up this error.
 
 - The 3 patch series "kernel/events/uprobes: uprobe_write_opcode()
   rewrite" from David Hildenbrand basically brings uprobe text poking into
   the current decade.  Remove a bunch of hand-rolled implementation in
   favor of using more current facilities.
 
 - The 3 patch series "mm/ptdump: Drop assumption that pxd_val() is u64"
   from Anshuman Khandual provides enhancements and generalizations to the
   pte dumping code.  This might be needed when 128-bit Page Table
   Descriptors are enabled for ARM.
 
 - The 12 patch series "Always call constructor for kernel page tables"
   from Kevin Brodsky "ensures that the ctor/dtor is always called for
   kernel pgtables, as it already is for user pgtables".  This permits the
   addition of more functionality such as "insert hooks to protect page
   tables".  This change does result in various architectures performing
   unnecesary work, but this is fixed up where it is anticipated to occur.
 
 - The 9 patch series "Rust support for mm_struct, vm_area_struct, and
   mmap" from Alice Ryhl adds plumbing to permit Rust access to core MM
   structures.
 
 - The 3 patch series "fix incorrectly disallowed anonymous VMA merges"
   from Lorenzo Stoakes takes advantage of some VMA merging opportunities
   which we've been missing for 15 years.
 
 - The 4 patch series "mm/madvise: batch tlb flushes for MADV_DONTNEED
   and MADV_FREE" from SeongJae Park optimizes process_madvise()'s TLB
   flushing.  Instead of flushing each address range in the provided iovec,
   we batch the flushing across all the iovec entries.  The syscall's cost
   was approximately halved with a microbenchmark which was designed to
   load this particular operation.
 
 - The 6 patch series "Track node vacancy to reduce worst case allocation
   counts" from Sidhartha Kumar makes the maple tree smarter about its node
   preallocation.  stress-ng mmap performance increased by single-digit
   percentages and the amount of unnecessarily preallocated memory was
   dramaticelly reduced.
 
 - The 3 patch series "mm/gup: Minor fix, cleanup and improvements" from
   Baoquan He removes a few unnecessary things which Baoquan noted when
   reading the code.
 
 - The 3 patch series ""Enhance sysfs handling for memory hotplug in
   weighted interleave" from Rakie Kim "enhances the weighted interleave
   policy in the memory management subsystem by improving sysfs handling,
   fixing memory leaks, and introducing dynamic sysfs updates for memory
   hotplug support".  Fixes things on error paths which we are unlikely to
   hit.
 
 - The 7 patch series "mm/damon: auto-tune DAMOS for NUMA setups
   including tiered memory" from SeongJae Park introduces new DAMOS quota
   goal metrics which eliminate the manual tuning which is required when
   utilizing DAMON for memory tiering.
 
 - The 5 patch series "mm/vmalloc.c: code cleanup and improvements" from
   Baoquan He provides cleanups and small efficiency improvements which
   Baoquan found via code inspection.
 
 - The 2 patch series "vmscan: enforce mems_effective during demotion"
   from Gregory Price "changes reclaim to respect cpuset.mems_effective
   during demotion when possible".  because "presently, reclaim explicitly
   ignores cpuset.mems_effective when demoting, which may cause the cpuset
   settings to violated." "This is useful for isolating workloads on a
   multi-tenant system from certain classes of memory more consistently."
 
 - The 2 patch series ""Clean up split_huge_pmd_locked() and remove
   unnecessary folio pointers" from Gavin Guo provides minor cleanups and
   efficiency gains in in the huge page splitting and migrating code.
 
 - The 3 patch series "Use kmem_cache for memcg alloc" from Huan Yang
   creates a slab cache for `struct mem_cgroup', yielding improved memory
   utilization.
 
 - The 4 patch series "add max arg to swappiness in memory.reclaim and
   lru_gen" from Zhongkun He adds a new "max" argument to the "swappiness="
   argument for memory.reclaim MGLRU's lru_gen.  This directs proactive
   reclaim to reclaim from only anon folios rather than file-backed folios.
 
 - The 17 patch series "kexec: introduce Kexec HandOver (KHO)" from Mike
   Rapoport is the first step on the path to permitting the kernel to
   maintain existing VMs while replacing the host kernel via file-based
   kexec.  At this time only memblock's reserve_mem is preserved.
 
 - The 7 patch series "mm: Introduce for_each_valid_pfn()" from David
   Woodhouse provides and uses a smarter way of looping over a pfn range.
   By skipping ranges of invalid pfns.
 
 - The 2 patch series "sched/numa: Skip VMA scanning on memory pinned to
   one NUMA node via cpuset.mems" from Libo Chen removes a lot of pointless
   VMA scanning when a task is pinned a single NUMA mode.  Dramatic
   performance benefits were seen in some real world cases.
 
 - The 2 patch series "JFS: Implement migrate_folio for
   jfs_metapage_aops" from Shivank Garg addresses a warning which occurs
   during memory compaction when using JFS.
 
 - The 4 patch series "move all VMA allocation, freeing and duplication
   logic to mm" from Lorenzo Stoakes moves some VMA code from kernel/fork.c
   into the more appropriate mm/vma.c.
 
 - The 6 patch series "mm, swap: clean up swap cache mapping helper" from
   Kairui Song provides code consolidation and cleanups related to the
   folio_index() function.
 
 - The 2 patch series "mm/gup: Cleanup memfd_pin_folios()" from Vishal
   Moola does that.
 
 - The 8 patch series "memcg: Fix test_memcg_min/low test failures" from
   Waiman Long addresses some bogus failures which are being reported by
   the test_memcontrol selftest.
 
 - The 3 patch series "eliminate mmap() retry merge, add .mmap_prepare
   hook" from Lorenzo Stoakes commences the deprecation of
   file_operations.mmap() in favor of the new
   file_operations.mmap_prepare().  The latter is more restrictive and
   prevents drivers from messing with things in ways which, amongst other
   problems, may defeat VMA merging.
 
 - The 4 patch series "memcg: decouple memcg and objcg stocks"" from
   Shakeel Butt decouples the per-cpu memcg charge cache from the objcg's
   one.  This is a step along the way to making memcg and objcg charging
   NMI-safe, which is a BPF requirement.
 
 - The 6 patch series "mm/damon: minor fixups and improvements for code,
   tests, and documents" from SeongJae Park is "yet another batch of
   miscellaneous DAMON changes.  Fix and improve minor problems in code,
   tests and documents."
 
 - The 7 patch series "memcg: make memcg stats irq safe" from Shakeel
   Butt converts memcg stats to be irq safe.  Another step along the way to
   making memcg charging and stats updates NMI-safe, a BPF requirement.
 
 - The 4 patch series "Let unmap_hugepage_range() and several related
   functions take folio instead of page" from Fan Ni provides folio
   conversions in the hugetlb code.
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Merge tag 'mm-stable-2025-05-31-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - "Add folio_mk_pte()" from Matthew Wilcox simplifies the act of
   creating a pte which addresses the first page in a folio and reduces
   the amount of plumbing which architecture must implement to provide
   this.

 - "Misc folio patches for 6.16" from Matthew Wilcox is a shower of
   largely unrelated folio infrastructure changes which clean things up
   and better prepare us for future work.

 - "memory,x86,acpi: hotplug memory alignment advisement" from Gregory
   Price adds early-init code to prevent x86 from leaving physical
   memory unused when physical address regions are not aligned to memory
   block size.

 - "mm/compaction: allow more aggressive proactive compaction" from
   Michal Clapinski provides some tuning of the (sadly, hard-coded (more
   sadly, not auto-tuned)) thresholds for our invokation of proactive
   compaction. In a simple test case, the reduction of a guest VM's
   memory consumption was dramatic.

 - "Minor cleanups and improvements to swap freeing code" from Kemeng
   Shi provides some code cleaups and a small efficiency improvement to
   this part of our swap handling code.

 - "ptrace: introduce PTRACE_SET_SYSCALL_INFO API" from Dmitry Levin
   adds the ability for a ptracer to modify syscalls arguments. At this
   time we can alter only "system call information that are used by
   strace system call tampering, namely, syscall number, syscall
   arguments, and syscall return value.

   This series should have been incorporated into mm.git's "non-MM"
   branch, but I goofed.

 - "fs/proc: extend the PAGEMAP_SCAN ioctl to report guard regions" from
   Andrei Vagin extends the info returned by the PAGEMAP_SCAN ioctl
   against /proc/pid/pagemap. This permits CRIU to more efficiently get
   at the info about guard regions.

 - "Fix parameter passed to page_mapcount_is_type()" from Gavin Shan
   implements that fix. No runtime effect is expected because
   validate_page_before_insert() happens to fix up this error.

 - "kernel/events/uprobes: uprobe_write_opcode() rewrite" from David
   Hildenbrand basically brings uprobe text poking into the current
   decade. Remove a bunch of hand-rolled implementation in favor of
   using more current facilities.

 - "mm/ptdump: Drop assumption that pxd_val() is u64" from Anshuman
   Khandual provides enhancements and generalizations to the pte dumping
   code. This might be needed when 128-bit Page Table Descriptors are
   enabled for ARM.

 - "Always call constructor for kernel page tables" from Kevin Brodsky
   ensures that the ctor/dtor is always called for kernel pgtables, as
   it already is for user pgtables.

   This permits the addition of more functionality such as "insert hooks
   to protect page tables". This change does result in various
   architectures performing unnecesary work, but this is fixed up where
   it is anticipated to occur.

 - "Rust support for mm_struct, vm_area_struct, and mmap" from Alice
   Ryhl adds plumbing to permit Rust access to core MM structures.

 - "fix incorrectly disallowed anonymous VMA merges" from Lorenzo
   Stoakes takes advantage of some VMA merging opportunities which we've
   been missing for 15 years.

 - "mm/madvise: batch tlb flushes for MADV_DONTNEED and MADV_FREE" from
   SeongJae Park optimizes process_madvise()'s TLB flushing.

   Instead of flushing each address range in the provided iovec, we
   batch the flushing across all the iovec entries. The syscall's cost
   was approximately halved with a microbenchmark which was designed to
   load this particular operation.

 - "Track node vacancy to reduce worst case allocation counts" from
   Sidhartha Kumar makes the maple tree smarter about its node
   preallocation.

   stress-ng mmap performance increased by single-digit percentages and
   the amount of unnecessarily preallocated memory was dramaticelly
   reduced.

 - "mm/gup: Minor fix, cleanup and improvements" from Baoquan He removes
   a few unnecessary things which Baoquan noted when reading the code.

 - ""Enhance sysfs handling for memory hotplug in weighted interleave"
   from Rakie Kim "enhances the weighted interleave policy in the memory
   management subsystem by improving sysfs handling, fixing memory
   leaks, and introducing dynamic sysfs updates for memory hotplug
   support". Fixes things on error paths which we are unlikely to hit.

 - "mm/damon: auto-tune DAMOS for NUMA setups including tiered memory"
   from SeongJae Park introduces new DAMOS quota goal metrics which
   eliminate the manual tuning which is required when utilizing DAMON
   for memory tiering.

 - "mm/vmalloc.c: code cleanup and improvements" from Baoquan He
   provides cleanups and small efficiency improvements which Baoquan
   found via code inspection.

 - "vmscan: enforce mems_effective during demotion" from Gregory Price
   changes reclaim to respect cpuset.mems_effective during demotion when
   possible. because presently, reclaim explicitly ignores
   cpuset.mems_effective when demoting, which may cause the cpuset
   settings to violated.

   This is useful for isolating workloads on a multi-tenant system from
   certain classes of memory more consistently.

 - "Clean up split_huge_pmd_locked() and remove unnecessary folio
   pointers" from Gavin Guo provides minor cleanups and efficiency gains
   in in the huge page splitting and migrating code.

 - "Use kmem_cache for memcg alloc" from Huan Yang creates a slab cache
   for `struct mem_cgroup', yielding improved memory utilization.

 - "add max arg to swappiness in memory.reclaim and lru_gen" from
   Zhongkun He adds a new "max" argument to the "swappiness=" argument
   for memory.reclaim MGLRU's lru_gen.

   This directs proactive reclaim to reclaim from only anon folios
   rather than file-backed folios.

 - "kexec: introduce Kexec HandOver (KHO)" from Mike Rapoport is the
   first step on the path to permitting the kernel to maintain existing
   VMs while replacing the host kernel via file-based kexec. At this
   time only memblock's reserve_mem is preserved.

 - "mm: Introduce for_each_valid_pfn()" from David Woodhouse provides
   and uses a smarter way of looping over a pfn range. By skipping
   ranges of invalid pfns.

 - "sched/numa: Skip VMA scanning on memory pinned to one NUMA node via
   cpuset.mems" from Libo Chen removes a lot of pointless VMA scanning
   when a task is pinned a single NUMA mode.

   Dramatic performance benefits were seen in some real world cases.

 - "JFS: Implement migrate_folio for jfs_metapage_aops" from Shivank
   Garg addresses a warning which occurs during memory compaction when
   using JFS.

 - "move all VMA allocation, freeing and duplication logic to mm" from
   Lorenzo Stoakes moves some VMA code from kernel/fork.c into the more
   appropriate mm/vma.c.

 - "mm, swap: clean up swap cache mapping helper" from Kairui Song
   provides code consolidation and cleanups related to the folio_index()
   function.

 - "mm/gup: Cleanup memfd_pin_folios()" from Vishal Moola does that.

 - "memcg: Fix test_memcg_min/low test failures" from Waiman Long
   addresses some bogus failures which are being reported by the
   test_memcontrol selftest.

 - "eliminate mmap() retry merge, add .mmap_prepare hook" from Lorenzo
   Stoakes commences the deprecation of file_operations.mmap() in favor
   of the new file_operations.mmap_prepare().

   The latter is more restrictive and prevents drivers from messing with
   things in ways which, amongst other problems, may defeat VMA merging.

 - "memcg: decouple memcg and objcg stocks"" from Shakeel Butt decouples
   the per-cpu memcg charge cache from the objcg's one.

   This is a step along the way to making memcg and objcg charging
   NMI-safe, which is a BPF requirement.

 - "mm/damon: minor fixups and improvements for code, tests, and
   documents" from SeongJae Park is yet another batch of miscellaneous
   DAMON changes. Fix and improve minor problems in code, tests and
   documents.

 - "memcg: make memcg stats irq safe" from Shakeel Butt converts memcg
   stats to be irq safe. Another step along the way to making memcg
   charging and stats updates NMI-safe, a BPF requirement.

 - "Let unmap_hugepage_range() and several related functions take folio
   instead of page" from Fan Ni provides folio conversions in the
   hugetlb code.

* tag 'mm-stable-2025-05-31-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (285 commits)
  mm: pcp: increase pcp->free_count threshold to trigger free_high
  mm/hugetlb: convert use of struct page to folio in __unmap_hugepage_range()
  mm/hugetlb: refactor __unmap_hugepage_range() to take folio instead of page
  mm/hugetlb: refactor unmap_hugepage_range() to take folio instead of page
  mm/hugetlb: pass folio instead of page to unmap_ref_private()
  memcg: objcg stock trylock without irq disabling
  memcg: no stock lock for cpu hot-unplug
  memcg: make __mod_memcg_lruvec_state re-entrant safe against irqs
  memcg: make count_memcg_events re-entrant safe against irqs
  memcg: make mod_memcg_state re-entrant safe against irqs
  memcg: move preempt disable to callers of memcg_rstat_updated
  memcg: memcg_rstat_updated re-entrant safe against irqs
  mm: khugepaged: decouple SHMEM and file folios' collapse
  selftests/eventfd: correct test name and improve messages
  alloc_tag: check mem_profiling_support in alloc_tag_init
  Docs/damon: update titles and brief introductions to explain DAMOS
  selftests/damon/_damon_sysfs: read tried regions directories in order
  mm/damon/tests/core-kunit: add a test for damos_set_filters_default_reject()
  mm/damon/paddr: remove unused variable, folio_list, in damon_pa_stat()
  mm/damon/sysfs-schemes: fix wrong comment on damons_sysfs_quota_goal_metric_strs
  ...
 2025-05-31 15:44:16 -07:00
Linus Torvalds
b08494a8f7 drm for 6.16-rc1 
new drivers:
 - bring in the asahi uapi header standalone
 - nova-drm: stub driver
 
 rust dependencies (for nova-core):
 - auxiliary
   - bus abstractions
   - driver registration
   - sample driver
 - devres changes from driver-core
 - revocable changes
 
 core:
 - add Apple fourcc modifiers
 - add virtio capset definitions
 - extend EXPORT_SYNC_FILE for timeline syncobjs
 - convert to devm_platform_ioremap_resource
 - refactor shmem helper page pinning
 - DP powerup/down link helpers
 - remove disgusting turds
 - extended %p4cc in vsprintf.c to support fourcc prints
 - change vsprintf %p4cn to %p4chR, remove %p4cn
 - Add drm_file_err function
 - IN_FORMATS_ASYNC property
 - move sitronix from tiny to their own subdir
 
 rust:
 - add drm core infrastructure rust abstractions
   (device/driver, ioctl, file, gem)
 
 dma-buf:
 - adjust sg handling to not cache map on attach
 - allow setting dma-device for import
 - Add a helper to sort and deduplicate dma_fence arrays
 
 docs:
 - updated drm scheduler docs
 - fbdev todo update
 - fb rendering
 - actual brightness
 
 ttm:
 - fix delayed destroy resv object
 
 bridge:
 - add kunit tests
 - convert tc358775 to atomic
 - convert drivers to devm_drm_bridge_alloc
 - convert rk3066_hdmi to bridge driver
 
 scheduler:
 - add kunit tests
 
 panel:
 - refcount panels to improve lifetime handling
 - Powertip PH128800T004-ZZA01
 - NLT NL13676BC25-03F, Tianma TM070JDHG34-00
 - Himax HX8279/HX8279-D DDIC
 - Visionox G2647FB105
 - Sitronix ST7571
 - ZOTAC rotation quirk
 
 vkms:
 - allow attaching more displays
 
 i915:
 - xe3lpd display updates
 - vrr refactor
 - intel_display struct conversions
 - xe2hpd memory type identification
 - add link rate/count to i915_display_info
 - cleanup VGA plane handling
 - refactor HDCP GSC
 - fix SLPC wait boosting reference counting
 - add 20ms delay to engine reset
 - fix fence release on early probe errors
 
 xe:
 - SRIOV updates
 - BMG PCI ID update
 - support separate firmware for each GT
 - SVM fix, prelim SVM multi-device work
 - export fan speed
 - temp disable d3cold on BMG
 - backup VRAM in PM notifier instead of suspend/freeze
 - update xe_ttm_access_memory to use GPU for non-visible access
 - fix guc_info debugfs for VFs
 - use copy_from_user instead of __copy_from_user
 - append PCIe gen5 limitations to xe_firmware document
 
 amdgpu:
 - DSC cleanup
 - DC Scaling updates
 - Fused I2C-over-AUX updates
 - DMUB updates
 - Use drm_file_err in amdgpu
 - Enforce isolation updates
 - Use new dma_fence helpers
 - USERQ fixes
 - Documentation updates
 - SR-IOV updates
 - RAS updates
 - PSP 12 cleanups
 - GC 9.5 updates
 - SMU 13.x updates
 - VCN / JPEG SR-IOV updates
 
 amdkfd:
 - Update error messages for SDMA
 - Userptr updates
 - XNACK fixes
 
 radeon:
 - CIK doorbell cleanup
 
 nouveau:
 - add support for NVIDIA r570 GSP firmware
 - enable Hopper/Blackwell support
 
 nova-core:
 - fix task list
 - register definition infrastructure
 - move firmware into own rust module
 - register auxiliary device for nova-drm
 
 nova-drm:
 - initial driver skeleton
 
 msm:
 - GPU:
   - ACD (adaptive clock distribution) for X1-85
   - drop fictional address_space_size
   - improve GMU HFI response time out robustness
   - fix crash when throttling during boot
 - DPU:
   - use single CTL path for flushing on DPU 5.x+
   - improve SSPP allocation code for better sharing
   - Enabled SmartDMA on SM8150, SC8180X, SC8280XP, SM8550
   - Added SAR2130P support
   - Disabled DSC support on MSM8937, MSM8917, MSM8953, SDM660
 - DP:
   - switch to new audio helpers
   - better LTTPR handling
 - DSI:
   - Added support for SA8775P
   - Added SAR2130P support
 - HDMI:
   - Switched to use new helpers for ACR data
   - Fixed old standing issue of HPD not working in some cases
 
 amdxdna:
 - add dma-buf support
 - allow empty command submits
 
 renesas:
 - add dma-buf support
 - add zpos, alpha, blend support
 
 panthor:
 - fail properly for NO_MMAP bos
 - add SET_LABEL ioctl
 - debugfs BO dumping support
 
 imagination:
 - update DT bindings
 - support TI AM68 GPU
 
 hibmc:
 - improve interrupt handling and HPD support
 
 virtio:
 - add panic handler support
 
 rockchip:
 - add RK3588 support
 - add DP AUX bus panel support
 
 ivpu:
 - add heartbeat based hangcheck
 
 mediatek:
 - prepares support for MT8195/99 HDMIv2/DDCv2
 
 anx7625:
 - improve HPD
 
 tegra:
 - speed up firmware loading
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Merge tag 'drm-next-2025-05-28' of https://gitlab.freedesktop.org/drm/kernel

Pull drm updates from Dave Airlie:
 "As part of building up nova-core/nova-drm pieces we've brought in some
  rust abstractions through this tree, aux bus being the main one, with
  devres changes also in the driver-core tree. Along with the drm core
  abstractions and enough nova-core/nova-drm to use them. This is still
  all stub work under construction, to build the nova driver upstream.

  The other big NVIDIA related one is nouveau adds support for
  Hopper/Blackwell GPUs, this required a new GSP firmware update to
  570.144, and a bunch of rework in order to support multiple fw
  interfaces.

  There is also the introduction of an asahi uapi header file as a
  precursor to getting the real driver in later, but to unblock
  userspace mesa packages while the driver is trapped behind rust
  enablement.

  Otherwise it's the usual mixture of stuff all over, amdgpu, i915/xe,
  and msm being the main ones, and some changes to vsprintf.

  new drivers:
   - bring in the asahi uapi header standalone
   - nova-drm: stub driver

  rust dependencies (for nova-core):
   - auxiliary
       - bus abstractions
       - driver registration
       - sample driver
   - devres changes from driver-core
   - revocable changes

  core:
   - add Apple fourcc modifiers
   - add virtio capset definitions
   - extend EXPORT_SYNC_FILE for timeline syncobjs
   - convert to devm_platform_ioremap_resource
   - refactor shmem helper page pinning
   - DP powerup/down link helpers
   - extended %p4cc in vsprintf.c to support fourcc prints
   - change vsprintf %p4cn to %p4chR, remove %p4cn
   - Add drm_file_err function
   - IN_FORMATS_ASYNC property
   - move sitronix from tiny to their own subdir

  rust:
   - add drm core infrastructure rust abstractions
     (device/driver, ioctl, file, gem)

  dma-buf:
   - adjust sg handling to not cache map on attach
   - allow setting dma-device for import
   - Add a helper to sort and deduplicate dma_fence arrays

  docs:
   - updated drm scheduler docs
   - fbdev todo update
   - fb rendering
   - actual brightness

  ttm:
   - fix delayed destroy resv object

  bridge:
   - add kunit tests
   - convert tc358775 to atomic
   - convert drivers to devm_drm_bridge_alloc
   - convert rk3066_hdmi to bridge driver

  scheduler:
   - add kunit tests

  panel:
   - refcount panels to improve lifetime handling
   - Powertip PH128800T004-ZZA01
   - NLT NL13676BC25-03F, Tianma TM070JDHG34-00
   - Himax HX8279/HX8279-D DDIC
   - Visionox G2647FB105
   - Sitronix ST7571
   - ZOTAC rotation quirk

  vkms:
   - allow attaching more displays

  i915:
   - xe3lpd display updates
   - vrr refactor
   - intel_display struct conversions
   - xe2hpd memory type identification
   - add link rate/count to i915_display_info
   - cleanup VGA plane handling
   - refactor HDCP GSC
   - fix SLPC wait boosting reference counting
   - add 20ms delay to engine reset
   - fix fence release on early probe errors

  xe:
   - SRIOV updates
   - BMG PCI ID update
   - support separate firmware for each GT
   - SVM fix, prelim SVM multi-device work
   - export fan speed
   - temp disable d3cold on BMG
   - backup VRAM in PM notifier instead of suspend/freeze
   - update xe_ttm_access_memory to use GPU for non-visible access
   - fix guc_info debugfs for VFs
   - use copy_from_user instead of __copy_from_user
   - append PCIe gen5 limitations to xe_firmware document

  amdgpu:
   - DSC cleanup
   - DC Scaling updates
   - Fused I2C-over-AUX updates
   - DMUB updates
   - Use drm_file_err in amdgpu
   - Enforce isolation updates
   - Use new dma_fence helpers
   - USERQ fixes
   - Documentation updates
   - SR-IOV updates
   - RAS updates
   - PSP 12 cleanups
   - GC 9.5 updates
   - SMU 13.x updates
   - VCN / JPEG SR-IOV updates

  amdkfd:
   - Update error messages for SDMA
   - Userptr updates
   - XNACK fixes

  radeon:
   - CIK doorbell cleanup

  nouveau:
   - add support for NVIDIA r570 GSP firmware
   - enable Hopper/Blackwell support

  nova-core:
   - fix task list
   - register definition infrastructure
   - move firmware into own rust module
   - register auxiliary device for nova-drm

  nova-drm:
   - initial driver skeleton

  msm:
   - GPU:
       - ACD (adaptive clock distribution) for X1-85
       - drop fictional address_space_size
       - improve GMU HFI response time out robustness
       - fix crash when throttling during boot
   - DPU:
       - use single CTL path for flushing on DPU 5.x+
       - improve SSPP allocation code for better sharing
       - Enabled SmartDMA on SM8150, SC8180X, SC8280XP, SM8550
       - Added SAR2130P support
       - Disabled DSC support on MSM8937, MSM8917, MSM8953, SDM660
   - DP:
       - switch to new audio helpers
       - better LTTPR handling
   - DSI:
       - Added support for SA8775P
       - Added SAR2130P support
   - HDMI:
       - Switched to use new helpers for ACR data
       - Fixed old standing issue of HPD not working in some cases

  amdxdna:
   - add dma-buf support
   - allow empty command submits

  renesas:
   - add dma-buf support
   - add zpos, alpha, blend support

  panthor:
   - fail properly for NO_MMAP bos
   - add SET_LABEL ioctl
   - debugfs BO dumping support

  imagination:
   - update DT bindings
   - support TI AM68 GPU

  hibmc:
   - improve interrupt handling and HPD support

  virtio:
   - add panic handler support

  rockchip:
   - add RK3588 support
   - add DP AUX bus panel support

  ivpu:
   - add heartbeat based hangcheck

  mediatek:
   - prepares support for MT8195/99 HDMIv2/DDCv2

  anx7625:
   - improve HPD

  tegra:
   - speed up firmware loading

* tag 'drm-next-2025-05-28' of https://gitlab.freedesktop.org/drm/kernel: (1627 commits)
  drm/nouveau/tegra: Fix error pointer vs NULL return in nvkm_device_tegra_resource_addr()
  drm/xe: Default auto_link_downgrade status to false
  drm/xe/guc: Make creation of SLPC debugfs files conditional
  drm/i915/display: Add check for alloc_ordered_workqueue() and alloc_workqueue()
  drm/i915/dp_mst: Work around Thunderbolt sink disconnect after SINK_COUNT_ESI read
  drm/i915/ptl: Use everywhere the correct DDI port clock select mask
  drm/nouveau/kms: add support for GB20x
  drm/dp: add option to disable zero sized address only transactions.
  drm/nouveau: add support for GB20x
  drm/nouveau/gsp: add hal for fifo.chan.doorbell_handle
  drm/nouveau: add support for GB10x
  drm/nouveau/gf100-: track chan progress with non-WFI semaphore release
  drm/nouveau/nv50-: separate CHANNEL_GPFIFO handling out from CHANNEL_DMA
  drm/nouveau: add helper functions for allocating pinned/cpu-mapped bos
  drm/nouveau: add support for GH100
  drm/nouveau: improve handling of 64-bit BARs
  drm/nouveau/gv100-: switch to volta semaphore methods
  drm/nouveau/gsp: support deeper page tables in COPY_SERVER_RESERVED_PDES
  drm/nouveau/gsp: init client VMMs with NV0080_CTRL_DMA_SET_PAGE_DIRECTORY
  drm/nouveau/gsp: fetch level shift and PDE from BAR2 VMM
  ...
 2025-05-28 09:46:39 -07:00
Linus Torvalds
23022f5456 dma-mapping updates for Linux 6.16: 
- new two step DMA mapping API, which is is a first step to a long path
   to provide alternatives to scatterlist and to remove hacks, abuses and
   design mistakes related to scatterlists; this new approach optimizes
   some calls to DMA-IOMMU layer and cache maintenance by batching them,
   reduces memory usage as it is no need to store mapped DMA addresses to
   unmap them, and reduces some function call overhead; it is a combination
   effort of many people, lead and developed by Christoph Hellwig and Leon
   Romanovsky
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 -----END PGP SIGNATURE-----

Merge tag 'dma-mapping-6.16-2025-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux

Pull dma-mapping updates from Marek Szyprowski:
 "New two step DMA mapping API, which is is a first step to a long path
  to provide alternatives to scatterlist and to remove hacks, abuses and
  design mistakes related to scatterlists.

  This new approach optimizes some calls to DMA-IOMMU layer and cache
  maintenance by batching them, reduces memory usage as it is no need to
  store mapped DMA addresses to unmap them, and reduces some function
  call overhead.  It is a combination effort of many people, lead and
  developed by Christoph Hellwig and Leon Romanovsky"

* tag 'dma-mapping-6.16-2025-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux:
  docs: core-api: document the IOVA-based API
  dma-mapping: add a dma_need_unmap helper
  dma-mapping: Implement link/unlink ranges API
  iommu/dma: Factor out a iommu_dma_map_swiotlb helper
  dma-mapping: Provide an interface to allow allocate IOVA
  iommu: add kernel-doc for iommu_unmap_fast
  iommu: generalize the batched sync after map interface
  dma-mapping: move the PCI P2PDMA mapping helpers to pci-p2pdma.h
  PCI/P2PDMA: Refactor the p2pdma mapping helpers
 2025-05-27 20:09:06 -07:00
Linus Torvalds
049294830b Thermal control updates for 6.16-rc1 
- Add Platform Temperature Control (PTC) support to the Intel int340x
    thermal driver (Srinivas Pandruvada).
 
  - Make the Hisilicon thermal driver compile by default when ARCH_HISI
    is set (Krzysztof Kozlowski).
 
  - Clean up printk() format by using %pC instead of %pCn in the bcm2835
    thermal driver (Luca Ceresoli).
 
  - Fix variable name coding style in the AmLogic thermal driver (Enrique
    Isidoro Vazquez Ramos).
 
  - Fix missing debugfs entry removal on failure by using the devm_
    variant in the LVTS thermal driver (AngeloGioacchino Del Regno).
 
  - Remove the unused lvts_debugfs_exit() function as the devm_ variant
    introduced before takes care of removing the debugfs entry in the
    LVTS driver (Arnd Bergmann).
 
  - Add the Airoha EN7581 thermal sensor support along with its DT
    bindings (Christian Marangi).
 
  - Add ipq5018 compatible string DT binding, cleanup and add its suppot
    to the QCom Tsens thermal driver (Sricharan Ramabadhran, George
    Moussalem).
 
  - Fix comments typos in the Airoha driver (Christian Marangi, Colin Ian
    King).
 
  - Address a sparse warning by making a local variable static in the
    QCom thermal driver (George Moussalem).
 
  - Fix the usage of the _SCP control method in the driver for ACPI
    thermal zones (Armin Wolf).
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Merge tag 'thermal-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull thermal control updates from Rafael Wysocki:
 "These add support for a new feature, Platform Temperature Control
  (PTC), to the Intel int340x thermal driver, add support for the Airoha
  EN7581 thermal sensor and the IPQ5018 platform, fix up the ACPI
  thermal zones handling, fix other assorted issues and clean up code

  Specifics:

   - Add Platform Temperature Control (PTC) support to the Intel int340x
     thermal driver (Srinivas Pandruvada)

   - Make the Hisilicon thermal driver compile by default when ARCH_HISI
     is set (Krzysztof Kozlowski)

   - Clean up printk() format by using %pC instead of %pCn in the
     bcm2835 thermal driver (Luca Ceresoli)

   - Fix variable name coding style in the AmLogic thermal driver
     (Enrique Isidoro Vazquez Ramos)

   - Fix missing debugfs entry removal on failure by using the devm_
     variant in the LVTS thermal driver (AngeloGioacchino Del Regno)

   - Remove the unused lvts_debugfs_exit() function as the devm_ variant
     introduced before takes care of removing the debugfs entry in the
     LVTS driver (Arnd Bergmann)

   - Add the Airoha EN7581 thermal sensor support along with its DT
     bindings (Christian Marangi)

   - Add ipq5018 compatible string DT binding, cleanup and add its
     suppot to the QCom Tsens thermal driver (Sricharan Ramabadhran,
     George Moussalem)

   - Fix comments typos in the Airoha driver (Christian Marangi, Colin
     Ian King)

   - Address a sparse warning by making a local variable static in the
     QCom thermal driver (George Moussalem)

   - Fix the usage of the _SCP control method in the driver for ACPI
     thermal zones (Armin Wolf)"

* tag 'thermal-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  thermal: qcom: ipq5018: make ops_ipq5018 struct static
  thermal/drivers/airoha: Fix spelling mistake "calibrarion" -> "calibration"
  ACPI: thermal: Execute _SCP before reading trip points
  ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"
  thermal/drivers/airoha: Fix spelling mistake
  thermal/drivers/qcom/tsens: Add support for IPQ5018 tsens
  thermal/drivers/qcom/tsens: Add support for tsens v1 without RPM
  thermal/drivers/qcom/tsens: Update conditions to strictly evaluate for IP v2+
  dt-bindings: thermal: qcom-tsens: Add ipq5018 compatible
  thermal/drivers: Add support for Airoha EN7581 thermal sensor
  dt-bindings: thermal: Add support for Airoha EN7581 thermal sensor
  thermal/drivers/mediatek/lvts: Remove unused lvts_debugfs_exit
  thermal/drivers/mediatek/lvts: Fix debugfs unregister on failure
  thermal/drivers/amlogic: Rename Uptat to uptat to follow kernel coding style
  vsprintf: remove redundant and unused %pCn format specifier
  thermal/drivers/bcm2835: Use %pC instead of %pCn
  thermal/drivers/hisi: Do not enable by default during compile testing
  thermal: int340x: processor_thermal: Platform temperature control documentation
  thermal: intel: int340x: Enable platform temperature control
  thermal: intel: int340x: Add platform temperature control interface
 2025-05-27 16:28:02 -07:00
Masahiro Yamada
40617439d5 docs/core-api/symbol-namespaces: drop table of contents and section numbering 
The manually updated table of contents and section numbering are hard
to maintain.

Make changes similar to the following commits:

  5e8f0ba38a ("docs/kbuild/makefiles: throw out the local table of contents")
  1a4c1c9df7 ("docs/kbuild/makefiles: drop section numbering, use references")

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
 2025-05-25 18:16:10 +09:00
Peter Zijlstra
707f853d7f module: Provide EXPORT_SYMBOL_GPL_FOR_MODULES() helper 
Helper macro to more easily limit the export of a symbol to a given
list of modules.

Eg:

  EXPORT_SYMBOL_GPL_FOR_MODULES(preempt_notifier_inc, "kvm");

will limit the use of said function to kvm.ko, any other module trying
to use this symbol will refure to load (and get modpost build
failures).

Requested-by: Masahiro Yamada <masahiroy@kernel.org>
Requested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
 2025-05-25 18:12:14 +09:00
Max Kellermann
6bb09e5db3
folio_queue: remove unused field marks3 
The last user was removed by commit e2d46f2ec3 ("netfs: Change the
read result collector to only use one work item").

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/20250519134813.2975312-10-dhowells@redhat.com
cc: Paulo Alcantara <pc@manguebit.com>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2025-05-21 14:34:38 +02:00
Jiri Slaby (SUSE)
a10024e671 irqdomain: Fix kernel-doc and add it to Documentation 
irqdomain.c's kernel-doc exists, but is not plugged into Documentation/
yet.

Before plugging it in, fix it first: irq_domain_get_irq_data() and
irq_domain_set_info() were documented twice. Identically, by both
definitions for CONFIG_IRQ_DOMAIN_HIERARCHY and !CONFIG_IRQ_DOMAIN_HIERARCHY.

Therefore, switch the second kernel-doc into an ordinary comment -- change
"/**" to simple "/*". This avoids sphinx's: WARNING: Duplicate C
declaration

Next, in commit b7b377332b ("irqdomain: Fix the kernel-doc and plug it
into Documentation"), irqdomain.h's (header) kernel-doc was added into
core-api/genericirq.rst. But given the amount of irqdomain functions and
structures, move all these to core-api/irq/irq-domain.rst now.

Finally, add these newly fixed irqdomain.c's (source) docs there as
well.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-58-jirislaby@kernel.org
 2025-05-16 21:06:13 +02:00
Jiri Slaby (SUSE)
a4efe303e5 Documentation: irqdomain: Update it 
The irqdomain documentaion became obsolete over time. Update and extend
it a bit with respect to the current code and HW.

Most notably the doubled documentation of irq_domain (from .rst and .h)
was unified and let only in .rst. A reference link was added to .h.

Furthermore:
 * Add some 'struct' keywords, so that the respective structs are
   hyperlinked
 * :c:member: use where appropriate to mark a member of a struct
 * Rephrase some wording to improve readability/understanding

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-57-jirislaby@kernel.org
 2025-05-16 21:06:13 +02:00
Jiri Slaby (SUSE)
95cfac1b2f Documentation: irq-domain.rst: Simple improvements 
The improvements include:

  * Capitals in headlines.
  * Add commas: for easier reading, it is always desired to add commas
    at some places in text. Like before adverbs or after fronted
    sentences.
  * 3rd person -> add 's' to verbs.
  * End some sentences with period and start a new one. Avoid thus heavy
    sentences.

[ tglx: Fix up subject prefix ]

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-56-jirislaby@kernel.org
 2025-05-16 21:06:13 +02:00
Jiri Slaby (SUSE)
225942f06e Documentation: irq/concepts: Minor improvements 
Just note in the docs:

 1) A PCI device as an example for shared interrupts
 2) A sparse tree can be used for interrupts too
 3) i8259s which have 8 pins

[ tglx: Fix up subject prefix ]

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-55-jirislaby@kernel.org
 2025-05-16 21:06:13 +02:00
Jiri Slaby (SUSE)
2f7bd3293e Documentation: irq/concepts: Add commas and reflow 
For easier reading, it is always desired to add commas at some places in
text. Like before adverbs or after fronted sentences.

[ tglx: Fix up subject prefix ]

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-54-jirislaby@kernel.org
 2025-05-16 21:06:13 +02:00
Jiri Slaby (SUSE)
14ebb11ba8 irqdomain: Drop irq_linear_revmap() 
irq_linear_revmap() is deprecated and unused now. So remove it.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-50-jirislaby@kernel.org
 2025-05-16 21:06:12 +02:00
Jiri Slaby (SUSE)
42b8b16fe5 irqdomain: Drop irq_domain_add_*() functions 
Most irq_domain_add_*() functions are unused now, so drop them. The
remaining ones are moved to the deprecated section and will be removed
during the merge window after the patches in various trees have been
merged.

Note: The Chinese docs are touched but unfinished. I cannot parse those.

[ tglx: Remove the leftover in irq-domain.rst and handle merge logistics ]

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-41-jirislaby@kernel.org
 2025-05-16 21:06:11 +02:00
Jiri Slaby (SUSE)
813da4f379 powerpc: Switch irq_domain_add_nomap() to use fwnode 
All irq_domain_add_*() functions are going away. PowerPC is the only
user of irq_domain_add_nomap() and there is no irq_domain_create_nomap()
complement.

Therefore, to align with the rest of the kernel, rename
irq_domain_add_nomap() to irq_domain_create_nomap() and accept a
fwnode_handle instead of a device_node.

[ tglx: Fix up subject prefix ]

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250319092951.37667-40-jirislaby@kernel.org
 2025-05-16 21:06:11 +02:00
Luca Ceresoli
592ebd77e6 vsprintf: remove redundant and unused %pCn format specifier 
%pC and %pCn print the same string, and commit 900cca2944 ("lib/vsprintf:
add %pC{,n,r} format specifiers for clocks") introducing them does not
clarify any intended difference. It can be assumed %pC is a default for
%pCn as some other specifiers do, but not all are consistent with this
policy. Moreover there is now no other suffix other than 'n', which makes a
default not really useful.

All users in the kernel were using %pC except for one which has been
converted. So now remove %pCn and all the unnecessary extra code and
documentation.

Acked-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Link: https://lore.kernel.org/r/20250311-vsprintf-pcn-v2-2-0af40fc7dee4@bootlin.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
 2025-05-16 12:50:00 +02:00
Mike Rapoport (Microsoft)
a3d2e34dce Documentation: KHO: add memblock bindings 
We introduced KHO into Linux: A framework that allows Linux to pass
metadata and memory across kexec from Linux to Linux.  KHO reuses fdt as
file format and shares a lot of the same properties of firmware-to- Linux
boot formats: It needs a stable, documented ABI that allows for forward
and backward compatibility as well as versioning.

As first user of KHO, we introduced memblock which can now preserve memory
ranges reserved with reserve_mem command line options contents across
kexec, so you can use the post-kexec kernel to read traces from the
pre-kexec kernel.

This patch adds memblock schemas similar to "device" device tree ones to a
new kho bindings directory.  This allows us to force contributors to
document the data that moves across KHO kexecs and catch breaking change
during review.

Link: https://lkml.kernel.org/r/20250509074635.3187114-18-changyuanl@google.com
Co-developed-by: Alexander Graf <graf@amazon.com>
Signed-off-by: Alexander Graf <graf@amazon.com>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Changyuan Lyu <changyuanl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anthony Yznaga <anthony.yznaga@oracle.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Gowans <jgowans@amazon.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Pratyush Yadav <ptyadav@amazon.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>
Cc: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-05-12 23:50:43 -07:00
Alexander Graf
3498209ff6 Documentation: add documentation for KHO 
With KHO in place, let's add documentation that describes what it is and
how to use it.

Link: https://lkml.kernel.org/r/20250509074635.3187114-17-changyuanl@google.com
Signed-off-by: Alexander Graf <graf@amazon.com>
Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Co-developed-by: Changyuan Lyu <changyuanl@google.com>
Signed-off-by: Changyuan Lyu <changyuanl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anthony Yznaga <anthony.yznaga@oracle.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Gowans <jgowans@amazon.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Pratyush Yadav <ptyadav@amazon.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>
Cc: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-05-12 23:50:42 -07:00
Christoph Hellwig
3ee7d94963 docs: core-api: document the IOVA-based API 
Add an explanation of the newly added IOVA-based mapping API.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
 2025-05-06 08:36:54 +02:00
Petr Mladek
37eed892cc vsprintf: Use %p4chR instead of %p4cn for reading data in reversed host ordering 
The generic FourCC format always prints the data using the big endian
order. It is generic because it allows to read the data using a custom
ordering.

The current code uses "n" for reading data in the reverse host ordering.
It makes the 4 variants [hnbl] consistent with the generic printing
of IPv4 addresses.

Unfortunately, it creates confusion on big endian systems. For example,
it shows the data &(u32)0x67503030 as

	%p4cn	00Pg (0x30305067)

But people expect that the ordering stays the same. The network ordering
is a big-endian ordering.

The problem is that the semantic is not the same. The modifiers affect
the output ordering of IPv4 addresses while they affect the reading order
in case of FourCC code.

Avoid the confusion by replacing the "n" modifier with "hR", aka
reverse host ordering. It is inspired by the existing %p[mM]R printf
format.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/r/CAMuHMdV9tX=TG7E_CrSF=2PY206tXf+_yYRuacG48EWEtJLo-Q@mail.gmail.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Aditya Garg <gargaditya08@live.com>
Link: https://lore.kernel.org/r/20250428123132.578771-1-pmladek@suse.com
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
 2025-04-29 09:29:33 -04:00
Hector Martin
1938479b27 lib/vsprintf: Add support for generic FourCCs by extending %p4cc 
%p4cc is designed for DRM/V4L2 FourCCs with their specific quirks, but
it's useful to be able to print generic 4-character codes formatted as
an integer. Extend it to add format specifiers for printing generic
32-bit FourCCs with various endian semantics:

%p4ch	Host byte order
%p4cn	Network byte order
%p4cl	Little-endian
%p4cb	Big-endian

The endianness determines how bytes are interpreted as a u32, and the
FourCC is then always printed MSByte-first (this is the opposite of
V4L/DRM FourCCs). This covers most practical cases, e.g. %p4cn would
allow printing LSByte-first FourCCs stored in host endian order
(other than the hex form being in character order, not the integer
value).

Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/PN3PR01MB9597B01823415CB7FCD3BC27B8B52@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
 2025-04-21 10:18:30 -04:00
Linus Torvalds
eb0ece1602 - The 6 patch series "Enable strict percpu address space checks" from 
Uros Bizjak uses x86 named address space qualifiers to provide
   compile-time checking of percpu area accesses.
 
   This has caused a small amount of fallout - two or three issues were
   reported.  In all cases the calling code was founf to be incorrect.
 
 - The 4 patch series "Some cleanup for memcg" from Chen Ridong
   implements some relatively monir cleanups for the memcontrol code.
 
 - The 17 patch series "mm: fixes for device-exclusive entries (hmm)"
   from David Hildenbrand fixes a boatload of issues which David found then
   using device-exclusive PTE entries when THP is enabled.  More work is
   needed, but this makes thins better - our own HMM selftests now succeed.
 
 - The 2 patch series "mm: zswap: remove z3fold and zbud" from Yosry
   Ahmed remove the z3fold and zbud implementations.  They have been
   deprecated for half a year and nobody has complained.
 
 - The 5 patch series "mm: further simplify VMA merge operation" from
   Lorenzo Stoakes implements numerous simplifications in this area.  No
   runtime effects are anticipated.
 
 - The 4 patch series "mm/madvise: remove redundant mmap_lock operations
   from process_madvise()" from SeongJae Park rationalizes the locking in
   the madvise() implementation.  Performance gains of 20-25% were observed
   in one MADV_DONTNEED microbenchmark.
 
 - The 12 patch series "Tiny cleanup and improvements about SWAP code"
   from Baoquan He contains a number of touchups to issues which Baoquan
   noticed when working on the swap code.
 
 - The 2 patch series "mm: kmemleak: Usability improvements" from Catalin
   Marinas implements a couple of improvements to the kmemleak user-visible
   output.
 
 - The 2 patch series "mm/damon/paddr: fix large folios access and
   schemes handling" from Usama Arif provides a couple of fixes for DAMON's
   handling of large folios.
 
 - The 3 patch series "mm/damon/core: fix wrong and/or useless
   damos_walk() behaviors" from SeongJae Park fixes a few issues with the
   accuracy of kdamond's walking of DAMON regions.
 
 - The 3 patch series "expose mapping wrprotect, fix fb_defio use" from
   Lorenzo Stoakes changes the interaction between framebuffer deferred-io
   and core MM.  No functional changes are anticipated - this is
   preparatory work for the future removal of page structure fields.
 
 - The 4 patch series "mm/damon: add support for hugepage_size DAMOS
   filter" from Usama Arif adds a DAMOS filter which permits the filtering
   by huge page sizes.
 
 - The 4 patch series "mm: permit guard regions for file-backed/shmem
   mappings" from Lorenzo Stoakes extends the guard region feature from its
   present "anon mappings only" state.  The feature now covers shmem and
   file-backed mappings.
 
 - The 4 patch series "mm: batched unmap lazyfree large folios during
   reclamation" from Barry Song cleans up and speeds up the unmapping for
   pte-mapped large folios.
 
 - The 18 patch series "reimplement per-vma lock as a refcount" from
   Suren Baghdasaryan puts the vm_lock back into the vma.  Our reasons for
   pulling it out were largely bogus and that change made the code more
   messy.  This patchset provides small (0-10%) improvements on one
   microbenchmark.
 
 - The 5 patch series "Docs/mm/damon: misc DAMOS filters documentation
   fixes and improves" from SeongJae Park does some maintenance work on the
   DAMON docs.
 
 - The 27 patch series "hugetlb/CMA improvements for large systems" from
   Frank van der Linden addresses a pile of issues which have been observed
   when using CMA on large machines.
 
 - The 2 patch series "mm/damon: introduce DAMOS filter type for unmapped
   pages" from SeongJae Park enables users of DMAON/DAMOS to filter my the
   page's mapped/unmapped status.
 
 - The 19 patch series "zsmalloc/zram: there be preemption" from Sergey
   Senozhatsky teaches zram to run its compression and decompression
   operations preemptibly.
 
 - The 12 patch series "selftests/mm: Some cleanups from trying to run
   them" from Brendan Jackman fixes a pile of unrelated issues which
   Brendan encountered while runnimg our selftests.
 
 - The 2 patch series "fs/proc/task_mmu: add guard region bit to pagemap"
   from Lorenzo Stoakes permits userspace to use /proc/pid/pagemap to
   determine whether a particular page is a guard page.
 
 - The 7 patch series "mm, swap: remove swap slot cache" from Kairui Song
   removes the swap slot cache from the allocation path - it simply wasn't
   being effective.
 
 - The 5 patch series "mm: cleanups for device-exclusive entries (hmm)"
   from David Hildenbrand implements a number of unrelated cleanups in this
   code.
 
 - The 5 patch series "mm: Rework generic PTDUMP configs" from Anshuman
   Khandual implements a number of preparatoty cleanups to the
   GENERIC_PTDUMP Kconfig logic.
 
 - The 8 patch series "mm/damon: auto-tune aggregation interval" from
   SeongJae Park implements a feedback-driven automatic tuning feature for
   DAMON's aggregation interval tuning.
 
 - The 5 patch series "Fix lazy mmu mode" from Ryan Roberts fixes some
   issues in powerpc, sparc and x86 lazy MMU implementations.  Ryan did
   this in preparation for implementing lazy mmu mode for arm64 to optimize
   vmalloc.
 
 - The 2 patch series "mm/page_alloc: Some clarifications for migratetype
   fallback" from Brendan Jackman reworks some commentary to make the code
   easier to follow.
 
 - The 3 patch series "page_counter cleanup and size reduction" from
   Shakeel Butt cleans up the page_counter code and fixes a size increase
   which we accidentally added late last year.
 
 - The 3 patch series "Add a command line option that enables control of
   how many threads should be used to allocate huge pages" from Thomas
   Prescher does that.  It allows the careful operator to significantly
   reduce boot time by tuning the parallalization of huge page
   initialization.
 
 - The 3 patch series "Fix calculations in trace_balance_dirty_pages()
   for cgwb" from Tang Yizhou fixes the tracing output from the dirty page
   balancing code.
 
 - The 9 patch series "mm/damon: make allow filters after reject filters
   useful and intuitive" from SeongJae Park improves the handling of allow
   and reject filters.  Behaviour is made more consistent and the
   documention is updated accordingly.
 
 - The 5 patch series "Switch zswap to object read/write APIs" from Yosry
   Ahmed updates zswap to the new object read/write APIs and thus permits
   the removal of some legacy code from zpool and zsmalloc.
 
 - The 6 patch series "Some trivial cleanups for shmem" from Baolin Wang
   does as it claims.
 
 - The 20 patch series "fs/dax: Fix ZONE_DEVICE page reference counts"
   from Alistair Popple regularizes the weird ZONE_DEVICE page refcount
   handling in DAX, permittig the removal of a number of special-case
   checks.
 
 - The 4 patch series "refactor mremap and fix bug" from Lorenzo Stoakes
   is a preparatoty refactoring and cleanup of the mremap() code.
 
 - The 20 patch series "mm: MM owner tracking for large folios (!hugetlb)
   + CONFIG_NO_PAGE_MAPCOUNT" from David Hildenbrand reworks the manner in
   which we determine whether a large folio is known to be mapped
   exclusively into a single MM.
 
 - The 8 patch series "mm/damon: add sysfs dirs for managing DAMOS
   filters based on handling layers" from SeongJae Park adds a couple of
   new sysfs directories to ease the management of DAMON/DAMOS filters.
 
 - The 13 patch series "arch, mm: reduce code duplication in mem_init()"
   from Mike Rapoport consolidates many per-arch implementations of
   mem_init() into code generic code, where that is practical.
 
 - The 13 patch series "mm/damon/sysfs: commit parameters online via
   damon_call()" from SeongJae Park continues the cleaning up of sysfs
   access to DAMON internal data.
 
 - The 3 patch series "mm: page_ext: Introduce new iteration API" from
   Luiz Capitulino reworks the page_ext initialization to fix a boot-time
   crash which was observed with an unusual combination of compile and
   cmdline options.
 
 - The 8 patch series "Buddy allocator like (or non-uniform) folio split"
   from Zi Yan reworks the code to split a folio into smaller folios.  The
   main benefit is lessened memory consumption: fewer post-split folios are
   generated.
 
 - The 2 patch series "Minimize xa_node allocation during xarry split"
   from Zi Yan reduces the number of xarray xa_nodes which are generated
   during an xarray split.
 
 - The 2 patch series "drivers/base/memory: Two cleanups" from Gavin Shan
   performs some maintenance work on the drivers/base/memory code.
 
 - The 3 patch series "Add tracepoints for lowmem reserves, watermarks
   and totalreserve_pages" from Martin Liu adds some more tracepoints to
   the page allocator code.
 
 - The 4 patch series "mm/madvise: cleanup requests validations and
   classifications" from SeongJae Park cleans up some warts which SeongJae
   observed during his earlier madvise work.
 
 - The 3 patch series "mm/hwpoison: Fix regressions in memory failure
   handling" from Shuai Xue addresses two quite serious regressions which
   Shuai has observed in the memory-failure implementation.
 
 - The 5 patch series "mm: reliable huge page allocator" from Johannes
   Weiner makes huge page allocations cheaper and more reliable by reducing
   fragmentation.
 
 - The 5 patch series "Minor memcg cleanups & prep for memdescs" from
   Matthew Wilcox is preparatory work for the future implementation of
   memdescs.
 
 - The 4 patch series "track memory used by balloon drivers" from Nico
   Pache introduces a way to track memory used by our various balloon
   drivers.
 
 - The 2 patch series "mm/damon: introduce DAMOS filter type for active
   pages" from Nhat Pham permits users to filter for active/inactive pages,
   separately for file and anon pages.
 
 - The 2 patch series "Adding Proactive Memory Reclaim Statistics" from
   Hao Jia separates the proactive reclaim statistics from the direct
   reclaim statistics.
 
 - The 2 patch series "mm/vmscan: don't try to reclaim hwpoison folio"
   from Jinjiang Tu fixes our handling of hwpoisoned pages within the
   reclaim code.
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Merge tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - The series "Enable strict percpu address space checks" from Uros
   Bizjak uses x86 named address space qualifiers to provide
   compile-time checking of percpu area accesses.

   This has caused a small amount of fallout - two or three issues were
   reported. In all cases the calling code was found to be incorrect.

 - The series "Some cleanup for memcg" from Chen Ridong implements some
   relatively monir cleanups for the memcontrol code.

 - The series "mm: fixes for device-exclusive entries (hmm)" from David
   Hildenbrand fixes a boatload of issues which David found then using
   device-exclusive PTE entries when THP is enabled. More work is
   needed, but this makes thins better - our own HMM selftests now
   succeed.

 - The series "mm: zswap: remove z3fold and zbud" from Yosry Ahmed
   remove the z3fold and zbud implementations. They have been deprecated
   for half a year and nobody has complained.

 - The series "mm: further simplify VMA merge operation" from Lorenzo
   Stoakes implements numerous simplifications in this area. No runtime
   effects are anticipated.

 - The series "mm/madvise: remove redundant mmap_lock operations from
   process_madvise()" from SeongJae Park rationalizes the locking in the
   madvise() implementation. Performance gains of 20-25% were observed
   in one MADV_DONTNEED microbenchmark.

 - The series "Tiny cleanup and improvements about SWAP code" from
   Baoquan He contains a number of touchups to issues which Baoquan
   noticed when working on the swap code.

 - The series "mm: kmemleak: Usability improvements" from Catalin
   Marinas implements a couple of improvements to the kmemleak
   user-visible output.

 - The series "mm/damon/paddr: fix large folios access and schemes
   handling" from Usama Arif provides a couple of fixes for DAMON's
   handling of large folios.

 - The series "mm/damon/core: fix wrong and/or useless damos_walk()
   behaviors" from SeongJae Park fixes a few issues with the accuracy of
   kdamond's walking of DAMON regions.

 - The series "expose mapping wrprotect, fix fb_defio use" from Lorenzo
   Stoakes changes the interaction between framebuffer deferred-io and
   core MM. No functional changes are anticipated - this is preparatory
   work for the future removal of page structure fields.

 - The series "mm/damon: add support for hugepage_size DAMOS filter"
   from Usama Arif adds a DAMOS filter which permits the filtering by
   huge page sizes.

 - The series "mm: permit guard regions for file-backed/shmem mappings"
   from Lorenzo Stoakes extends the guard region feature from its
   present "anon mappings only" state. The feature now covers shmem and
   file-backed mappings.

 - The series "mm: batched unmap lazyfree large folios during
   reclamation" from Barry Song cleans up and speeds up the unmapping
   for pte-mapped large folios.

 - The series "reimplement per-vma lock as a refcount" from Suren
   Baghdasaryan puts the vm_lock back into the vma. Our reasons for
   pulling it out were largely bogus and that change made the code more
   messy. This patchset provides small (0-10%) improvements on one
   microbenchmark.

 - The series "Docs/mm/damon: misc DAMOS filters documentation fixes and
   improves" from SeongJae Park does some maintenance work on the DAMON
   docs.

 - The series "hugetlb/CMA improvements for large systems" from Frank
   van der Linden addresses a pile of issues which have been observed
   when using CMA on large machines.

 - The series "mm/damon: introduce DAMOS filter type for unmapped pages"
   from SeongJae Park enables users of DMAON/DAMOS to filter my the
   page's mapped/unmapped status.

 - The series "zsmalloc/zram: there be preemption" from Sergey
   Senozhatsky teaches zram to run its compression and decompression
   operations preemptibly.

 - The series "selftests/mm: Some cleanups from trying to run them" from
   Brendan Jackman fixes a pile of unrelated issues which Brendan
   encountered while runnimg our selftests.

 - The series "fs/proc/task_mmu: add guard region bit to pagemap" from
   Lorenzo Stoakes permits userspace to use /proc/pid/pagemap to
   determine whether a particular page is a guard page.

 - The series "mm, swap: remove swap slot cache" from Kairui Song
   removes the swap slot cache from the allocation path - it simply
   wasn't being effective.

 - The series "mm: cleanups for device-exclusive entries (hmm)" from
   David Hildenbrand implements a number of unrelated cleanups in this
   code.

 - The series "mm: Rework generic PTDUMP configs" from Anshuman Khandual
   implements a number of preparatoty cleanups to the GENERIC_PTDUMP
   Kconfig logic.

 - The series "mm/damon: auto-tune aggregation interval" from SeongJae
   Park implements a feedback-driven automatic tuning feature for
   DAMON's aggregation interval tuning.

 - The series "Fix lazy mmu mode" from Ryan Roberts fixes some issues in
   powerpc, sparc and x86 lazy MMU implementations. Ryan did this in
   preparation for implementing lazy mmu mode for arm64 to optimize
   vmalloc.

 - The series "mm/page_alloc: Some clarifications for migratetype
   fallback" from Brendan Jackman reworks some commentary to make the
   code easier to follow.

 - The series "page_counter cleanup and size reduction" from Shakeel
   Butt cleans up the page_counter code and fixes a size increase which
   we accidentally added late last year.

 - The series "Add a command line option that enables control of how
   many threads should be used to allocate huge pages" from Thomas
   Prescher does that. It allows the careful operator to significantly
   reduce boot time by tuning the parallalization of huge page
   initialization.

 - The series "Fix calculations in trace_balance_dirty_pages() for cgwb"
   from Tang Yizhou fixes the tracing output from the dirty page
   balancing code.

 - The series "mm/damon: make allow filters after reject filters useful
   and intuitive" from SeongJae Park improves the handling of allow and
   reject filters. Behaviour is made more consistent and the documention
   is updated accordingly.

 - The series "Switch zswap to object read/write APIs" from Yosry Ahmed
   updates zswap to the new object read/write APIs and thus permits the
   removal of some legacy code from zpool and zsmalloc.

 - The series "Some trivial cleanups for shmem" from Baolin Wang does as
   it claims.

 - The series "fs/dax: Fix ZONE_DEVICE page reference counts" from
   Alistair Popple regularizes the weird ZONE_DEVICE page refcount
   handling in DAX, permittig the removal of a number of special-case
   checks.

 - The series "refactor mremap and fix bug" from Lorenzo Stoakes is a
   preparatoty refactoring and cleanup of the mremap() code.

 - The series "mm: MM owner tracking for large folios (!hugetlb) +
   CONFIG_NO_PAGE_MAPCOUNT" from David Hildenbrand reworks the manner in
   which we determine whether a large folio is known to be mapped
   exclusively into a single MM.

 - The series "mm/damon: add sysfs dirs for managing DAMOS filters based
   on handling layers" from SeongJae Park adds a couple of new sysfs
   directories to ease the management of DAMON/DAMOS filters.

 - The series "arch, mm: reduce code duplication in mem_init()" from
   Mike Rapoport consolidates many per-arch implementations of
   mem_init() into code generic code, where that is practical.

 - The series "mm/damon/sysfs: commit parameters online via
   damon_call()" from SeongJae Park continues the cleaning up of sysfs
   access to DAMON internal data.

 - The series "mm: page_ext: Introduce new iteration API" from Luiz
   Capitulino reworks the page_ext initialization to fix a boot-time
   crash which was observed with an unusual combination of compile and
   cmdline options.

 - The series "Buddy allocator like (or non-uniform) folio split" from
   Zi Yan reworks the code to split a folio into smaller folios. The
   main benefit is lessened memory consumption: fewer post-split folios
   are generated.

 - The series "Minimize xa_node allocation during xarry split" from Zi
   Yan reduces the number of xarray xa_nodes which are generated during
   an xarray split.

 - The series "drivers/base/memory: Two cleanups" from Gavin Shan
   performs some maintenance work on the drivers/base/memory code.

 - The series "Add tracepoints for lowmem reserves, watermarks and
   totalreserve_pages" from Martin Liu adds some more tracepoints to the
   page allocator code.

 - The series "mm/madvise: cleanup requests validations and
   classifications" from SeongJae Park cleans up some warts which
   SeongJae observed during his earlier madvise work.

 - The series "mm/hwpoison: Fix regressions in memory failure handling"
   from Shuai Xue addresses two quite serious regressions which Shuai
   has observed in the memory-failure implementation.

 - The series "mm: reliable huge page allocator" from Johannes Weiner
   makes huge page allocations cheaper and more reliable by reducing
   fragmentation.

 - The series "Minor memcg cleanups & prep for memdescs" from Matthew
   Wilcox is preparatory work for the future implementation of memdescs.

 - The series "track memory used by balloon drivers" from Nico Pache
   introduces a way to track memory used by our various balloon drivers.

 - The series "mm/damon: introduce DAMOS filter type for active pages"
   from Nhat Pham permits users to filter for active/inactive pages,
   separately for file and anon pages.

 - The series "Adding Proactive Memory Reclaim Statistics" from Hao Jia
   separates the proactive reclaim statistics from the direct reclaim
   statistics.

 - The series "mm/vmscan: don't try to reclaim hwpoison folio" from
   Jinjiang Tu fixes our handling of hwpoisoned pages within the reclaim
   code.

* tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (431 commits)
  mm/page_alloc: remove unnecessary __maybe_unused in order_to_pindex()
  x86/mm: restore early initialization of high_memory for 32-bits
  mm/vmscan: don't try to reclaim hwpoison folio
  mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper
  cgroup: docs: add pswpin and pswpout items in cgroup v2 doc
  mm: vmscan: split proactive reclaim statistics from direct reclaim statistics
  selftests/mm: speed up split_huge_page_test
  selftests/mm: uffd-unit-tests support for hugepages > 2M
  docs/mm/damon/design: document active DAMOS filter type
  mm/damon: implement a new DAMOS filter type for active pages
  fs/dax: don't disassociate zero page entries
  MM documentation: add "Unaccepted" meminfo entry
  selftests/mm: add commentary about 9pfs bugs
  fork: use __vmalloc_node() for stack allocation
  docs/mm: Physical Memory: Populate the "Zones" section
  xen: balloon: update the NR_BALLOON_PAGES state
  hv_balloon: update the NR_BALLOON_PAGES state
  balloon_compaction: update the NR_BALLOON_PAGES state
  meminfo: add a per node counter for balloon drivers
  mm: remove references to folio in __memcg_kmem_uncharge_page()
  ...
 2025-04-01 09:29:18 -07:00
Linus Torvalds
3ba7dfb8da RCU pull request for v6.15 
This pull request contains the following branches:
 
 docs.2025.02.04a:
  - Add broken-timing possibility to stallwarn.rst.
  - Improve discussion of this_cpu_ptr(), add raw_cpu_ptr().
  - Document self-propagating callbacks.
  - Point call_srcu() to call_rcu() for detailed memory ordering.
  - Add CONFIG_RCU_LAZY delays to call_rcu() kernel-doc header.
  - Clarify RCU_LAZY and RCU_LAZY_DEFAULT_OFF help text.
  - Remove references to old grace-period-wait primitives.
 
 srcu.2025.02.05a:
  - Introduce srcu_read_{un,}lock_fast(), which is similar to
    srcu_read_{un,}lock_lite(): avoid smp_mb()s in lock and unlock at the
    cost of calling synchronize_rcu() in synchronize_srcu(). Moreover, by
    returning the percpu offset of the counter at srcu_read_lock_fast()
    time, srcu_read_unlock_fast() can save extra pointer dereferencing,
    which makes it faster than srcu_read_{un,}lock_lite().
    srcu_read_{un,}lock_fast() are intended to replace
    rcu_read_{un,}lock_trace() if possible.
 
 torture.2025.02.05a:
  - Add get_torture_init_jiffies() to return the start time of the test.
  - Add a test_boost_holdoff module parameter to allow delaying boosting
    tests when building rcutorture as built-in.
  - Add grace period sequence number logging at the beginning and end of
    failure/close-call results.
  - Switch to hexadecimal for the expedited grace period sequence number
    in the rcu_exp_grace_period trace point.
  - Make cur_ops->format_gp_seqs take buffer length.
  - Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool.
  - Complain when invalid SRCU reader_flavor is specified.
  - Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing, which forces SRCU
    uses atomics even when percpu ops are NMI safe, and use the Kconfig
    for SRCU lockdep testing.
 
 misc.2025.03.04a:
  - Split rcu_report_exp_cpu_mult() mask parameter and use for tracing.
  - Remove READ_ONCE() for rdp->gpwrap access in __note_gp_changes().
  - Fix get_state_synchronize_rcu_full() GP-start detection.
  - Move RCU Tasks self-tests to core_initcall().
  - Print segment lengths in show_rcu_nocb_gp_state().
  - Make RCU watch ct_kernel_exit_state() warning.
  - Flush console log from kernel_power_off().
  - rcutorture: Allow a negative value for nfakewriters.
  - rcu: Update TREE05.boot to test normal synchronize_rcu().
  - rcu: Use _full() API to debug synchronize_rcu().
 
 lazypreempt.2025.03.04a: Make RCU handle PREEMPT_LAZY better:
  - Fix header guard for rcu_all_qs().
  - rcu: Rename PREEMPT_AUTO to PREEMPT_LAZY.
  - Update __cond_resched comment about RCU quiescent states.
  - Handle unstable rdp in rcu_read_unlock_strict().
  - Handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y.
  - osnoise: Provide quiescent states.
  - Adjust rcutorture with possible PREEMPT_RCU=n && PREEMPT_COUNT=y
    combination.
  - Limit PREEMPT_RCU configurations.
  - Make rcutorture senario TREE07 and senario TREE10 use PREEMPT_LAZY=y.
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Merge tag 'rcu-next-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

Pull RCU updates from Boqun Feng:
 "Documentation:
   - Add broken-timing possibility to stallwarn.rst
   - Improve discussion of this_cpu_ptr(), add raw_cpu_ptr()
   - Document self-propagating callbacks
   - Point call_srcu() to call_rcu() for detailed memory ordering
   - Add CONFIG_RCU_LAZY delays to call_rcu() kernel-doc header
   - Clarify RCU_LAZY and RCU_LAZY_DEFAULT_OFF help text
   - Remove references to old grace-period-wait primitives

  srcu:
   - Introduce srcu_read_{un,}lock_fast(), which is similar to
     srcu_read_{un,}lock_lite(): avoid smp_mb()s in lock and unlock
     at the cost of calling synchronize_rcu() in synchronize_srcu()

     Moreover, by returning the percpu offset of the counter at
     srcu_read_lock_fast() time, srcu_read_unlock_fast() can avoid
     extra pointer dereferencing, which makes it faster than
     srcu_read_{un,}lock_lite()

     srcu_read_{un,}lock_fast() are intended to replace
     rcu_read_{un,}lock_trace() if possible

  RCU torture:
   - Add get_torture_init_jiffies() to return the start time of the test
   - Add a test_boost_holdoff module parameter to allow delaying
     boosting tests when building rcutorture as built-in
   - Add grace period sequence number logging at the beginning and end
     of failure/close-call results
   - Switch to hexadecimal for the expedited grace period sequence
     number in the rcu_exp_grace_period trace point
   - Make cur_ops->format_gp_seqs take buffer length
   - Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool
   - Complain when invalid SRCU reader_flavor is specified
   - Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing, which forces SRCU
     uses atomics even when percpu ops are NMI safe, and use the Kconfig
     for SRCU lockdep testing

  Misc:
   - Split rcu_report_exp_cpu_mult() mask parameter and use for tracing
   - Remove READ_ONCE() for rdp->gpwrap access in __note_gp_changes()
   - Fix get_state_synchronize_rcu_full() GP-start detection
   - Move RCU Tasks self-tests to core_initcall()
   - Print segment lengths in show_rcu_nocb_gp_state()
   - Make RCU watch ct_kernel_exit_state() warning
   - Flush console log from kernel_power_off()
   - rcutorture: Allow a negative value for nfakewriters
   - rcu: Update TREE05.boot to test normal synchronize_rcu()
   - rcu: Use _full() API to debug synchronize_rcu()

  Make RCU handle PREEMPT_LAZY better:
   - Fix header guard for rcu_all_qs()
   - rcu: Rename PREEMPT_AUTO to PREEMPT_LAZY
   - Update __cond_resched comment about RCU quiescent states
   - Handle unstable rdp in rcu_read_unlock_strict()
   - Handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y
   - osnoise: Provide quiescent states
   - Adjust rcutorture with possible PREEMPT_RCU=n && PREEMPT_COUNT=y
     combination
   - Limit PREEMPT_RCU configurations
   - Make rcutorture senario TREE07 and senario TREE10 use
     PREEMPT_LAZY=y"

* tag 'rcu-next-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux: (59 commits)
  rcutorture: Make scenario TREE07 build CONFIG_PREEMPT_LAZY=y
  rcutorture: Make scenario TREE10 build CONFIG_PREEMPT_LAZY=y
  rcu: limit PREEMPT_RCU configurations
  rcutorture: Update ->extendables check for lazy preemption
  rcutorture: Update rcutorture_one_extend_check() for lazy preemption
  osnoise: provide quiescent states
  rcu: Use _full() API to debug synchronize_rcu()
  rcu: Update TREE05.boot to test normal synchronize_rcu()
  rcutorture: Allow a negative value for nfakewriters
  Flush console log from kernel_power_off()
  context_tracking: Make RCU watch ct_kernel_exit_state() warning
  rcu/nocb: Print segment lengths in show_rcu_nocb_gp_state()
  rcu-tasks: Move RCU Tasks self-tests to core_initcall()
  rcu: Fix get_state_synchronize_rcu_full() GP-start detection
  torture: Make SRCU lockdep testing use srcu_read_lock_nmisafe()
  srcu: Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing
  rcutorture: Complain when invalid SRCU reader_flavor is specified
  rcutorture: Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool
  rcutorture: Make cur_ops->format_gp_seqs take buffer length
  rcutorture: Add ftrace-compatible timestamp to GP# failure/close-call output
  ...
 2025-03-24 19:41:37 -07:00
Linus Torvalds
f81c2b8150 It has been a reasonably busy cycle for docs... 
- Significant changes throughout the tree to bring Python code up to
   current standards and raise the minimum Python required to 3.9.  Much of
   this is preparatory to replacing the ancient Perl scripts/kernel-doc
   horror with a slightly less horrifying Python implementation, expected
   for 6.16.
 
 - Update the minimum Sphinx required to 3.4.3, allowing us to remove a
   bunch of older compatibility code.
 
 - Rework and improve the generation of the ABI documentation.
 
   (All of the above done by Mauro)
 
 - Lots of translation updates.  Alex Shi and Yanteng Si are taking on
   responsibility for the Chinese translations going forward; that work will
   still get to you via docs-next
 
 - Try to standardize the format for indicating a developer's affiliation in
   commit tags.
 
 - Clarify the TAB's role in CoC enforcement actions.
 
 - Try to spell out the rules for when a commit tag can name another
   developer without their explicit permission.
 
 Plus lots of other typo fixes and updates.
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Merge tag 'docs-6.15' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "It has been a reasonably busy cycle for docs...

   - Significant changes throughout the tree to bring Python code up to
     current standards and raise the minimum Python required to 3.9

     Much of this is preparatory to replacing the ancient Perl
     scripts/kernel-doc horror with a slightly less horrifying Python
     implementation, expected for 6.16

   - Update the minimum Sphinx required to 3.4.3, allowing us to remove
     a bunch of older compatibility code

   - Rework and improve the generation of the ABI documentation

  (All of the above done by Mauro)

   - Lots of translation updates. Alex Shi and Yanteng Si are taking on
     responsibility for the Chinese translations going forward; that
     work will still get to you via docs-next

   - Try to standardize the format for indicating a developer's
     affiliation in commit tags

   - Clarify the TAB's role in CoC enforcement actions

   - Try to spell out the rules for when a commit tag can name another
     developer without their explicit permission

  Plus lots of other typo fixes and updates"

* tag 'docs-6.15' of git://git.lwn.net/linux: (98 commits)
  docs/zh_CN: fix spelling mistake
  docs/Chinese: change the disclaimer words
  docs/zh_CN: Add snp-tdx-threat-model index Chinese translation
  docs: driver-api: firmware: clarify userspace requirements
  docs: clarify rules wrt tagging other people
  docs: Remove outdated highuid.rst documentation
  Documentation: dma-buf: heaps: Add heap name definitions
  docs/.../submit-checklist: Use Documentation/admin-guide/abi.rst for cross-ref of README
  docs: Correct installation instruction
  Documentation: kcsan: fix "Plain Accesses and Data Races" URL in kcsan.rst
  Documentation/CoC: Spell out the TAB role in enforcement decisions
  Documentation: ocxl.rst: Update consortium site
  scripts: get_feat.pl: substitute s390x with s390
  scripts/kernel-doc: drop dead code for Wcontents_before_sections
  scripts/kernel-doc: don't add not needed new lines
  docs: driver-api/infiniband.rst: fix Kerneldoc markup
  drivers: firewire: firewire-cdev.h: fix identation on a kernel-doc markup
  drivers: media: intel-ipu3.h: fix identation on a kernel-doc markup
  include/asm-generic/io.h: fix kerneldoc markup
  Docs/arch/arm64: Fix spelling in amu.rst
  ...
 2025-03-24 18:42:27 -07:00
Zi Yan
3fec86f8aa xarray: add xas_try_split() to split a multi-index entry 
Patch series "Buddy allocator like (or non-uniform) folio split", v10.

This patchset adds a new buddy allocator like (or non-uniform) large folio
split from a order-n folio to order-m with m < n.  It reduces

1. the total number of after-split folios from 2^(n-m) to n-m+1;

2. the amount of memory needed for multi-index xarray split from 2^(n/6-m/6) to
   n/6-m/6, assuming XA_CHUNK_SHIFT=6;

3. keep more large folios after a split from all order-m folios to
   order-(n-1) to order-m folios.

For example, to split an order-9 to order-0, folio split generates 10 (or
11 for anonymous memory) folios instead of 512, allocates 1 xa_node
instead of 8, and leaves 1 order-8, 1 order-7, ..., 1 order-1 and 2
order-0 folios (or 4 order-0 for anonymous memory) instead of 512 order-0
folios.

Instead of duplicating existing split_huge_page*() code, __folio_split()
is introduced as the shared backend code for both
split_huge_page_to_list_to_order() and folio_split().  __folio_split() can
support both uniform split and buddy allocator like (or non-uniform)
split.  All existing split_huge_page*() users can be gradually converted
to use folio_split() if possible.  In this patchset, I converted
truncate_inode_partial_folio() to use folio_split().

xfstests quick group passed for both tmpfs and xfs.  I also
semi-replicated Hugh's test[12] and ran it without any issue for almost 24
hours.


This patch (of 8):

A preparation patch for non-uniform folio split, which always split a
folio into half iteratively, and minimal xarray entry split.

Currently, xas_split_alloc() and xas_split() always split all slots from a
multi-index entry.  They cost the same number of xa_node as the
to-be-split slots.  For example, to split an order-9 entry, which takes
2^(9-6)=8 slots, assuming XA_CHUNK_SHIFT is 6 (!CONFIG_BASE_SMALL), 8
xa_node are needed.  Instead xas_try_split() is intended to be used
iteratively to split the order-9 entry into 2 order-8 entries, then split
one order-8 entry, based on the given index, to 2 order-7 entries, ...,
and split one order-1 entry to 2 order-0 entries.  When splitting the
order-6 entry and a new xa_node is needed, xas_try_split() will try to
allocate one if possible.  As a result, xas_try_split() would only need 1
xa_node instead of 8.

When a new xa_node is needed during the split, xas_try_split() can try to
allocate one but no more.  -ENOMEM will be return if a node cannot be
allocated.  -EINVAL will be return if a sibling node is split or cascade
split happens, where two or more new nodes are needed, and these are not
supported by xas_try_split().

xas_split_alloc() and xas_split() split an order-9 to order-0:

         ---------------------------------
         |   |   |   |   |   |   |   |   |
         | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
         |   |   |   |   |   |   |   |   |
         ---------------------------------
           |   |                   |   |
     -------   ---               ---   -------
     |           |     ...       |           |
     V           V               V           V
----------- -----------     ----------- -----------
| xa_node | | xa_node | ... | xa_node | | xa_node |
----------- -----------     ----------- -----------

xas_try_split() splits an order-9 to order-0:
   ---------------------------------
   |   |   |   |   |   |   |   |   |
   | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
   |   |   |   |   |   |   |   |   |
   ---------------------------------
     |
     |
     V
-----------
| xa_node |
-----------

Link: https://lkml.kernel.org/r/20250307174001.242794-1-ziy@nvidia.com
Link: https://lkml.kernel.org/r/20250307174001.242794-2-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-03-17 22:06:59 -07:00
Suren Baghdasaryan
7f8ceea0c5 refcount: provide ops for cases when object's memory can be reused 
For speculative lookups where a successful inc_not_zero() pins the object,
but where we still need to double check if the object acquired is indeed
the one we set out to acquire (identity check), needs this validation to
happen *after* the increment.  Similarly, when a new object is initialized
and its memory might have been previously occupied by another object, all
stores to initialize the object should happen *before* refcount
initialization.

Notably SLAB_TYPESAFE_BY_RCU is one such an example when this ordering is
required for reference counting.

Add refcount_{add|inc}_not_zero_acquire() to guarantee the proper ordering
between acquiring a reference count on an object and performing the
identity check for that object.

Add refcount_set_release() to guarantee proper ordering between stores
initializing object attributes and the store initializing the refcount. 
refcount_set_release() should be done after all other object attributes
are initialized.  Once refcount_set_release() is called, the object should
be considered visible to other tasks even if it was not yet added into an
object collection normally used to discover it.  This is because other
tasks might have discovered the object previously occupying the same
memory and after memory reuse they can succeed in taking refcount for the
new object and start using it.

Object reuse example to consider:

consumer:
    obj = lookup(collection, key);
    if (!refcount_inc_not_zero_acquire(&obj->ref))
        return;
    if (READ_ONCE(obj->key) != key) { /* identity check */
        put_ref(obj);
        return;
    }
    use(obj->value);

                 producer:
                     remove(collection, obj->key);
                     if (!refcount_dec_and_test(&obj->ref))
                         return;
                     obj->key = KEY_INVALID;
                     free(obj);
                     obj = malloc(); /* obj is reused */
                     obj->key = new_key;
                     obj->value = new_value;
                     refcount_set_release(obj->ref, 1);
                     add(collection, new_key, obj);

refcount_{add|inc}_not_zero_acquire() is required to prevent the following
reordering when refcount_inc_not_zero() is used instead:

consumer:
    obj = lookup(collection, key);
    if (READ_ONCE(obj->key) != key) { /* reordered identity check */
        put_ref(obj);
        return;
    }
                 producer:
                     remove(collection, obj->key);
                     if (!refcount_dec_and_test(&obj->ref))
                         return;
                     obj->key = KEY_INVALID;
                     free(obj);
                     obj = malloc(); /* obj is reused */
                     obj->key = new_key;
                     obj->value = new_value;
                     refcount_set_release(obj->ref, 1);
                     add(collection, new_key, obj);

    if (!refcount_inc_not_zero(&obj->ref))
        return;
    use(obj->value); /* USING WRONG OBJECT */

refcount_set_release() is required to prevent the following reordering
when refcount_set() is used instead:

consumer:
    obj = lookup(collection, key);

                 producer:
                     remove(collection, obj->key);
                     if (!refcount_dec_and_test(&obj->ref))
                         return;
                     obj->key = KEY_INVALID;
                     free(obj);
                     obj = malloc(); /* obj is reused */
                     obj->key = new_key; /* new_key == old_key */
                     refcount_set(obj->ref, 1);

    if (!refcount_inc_not_zero_acquire(&obj->ref))
        return;
    if (READ_ONCE(obj->key) != key) { /* pass since new_key == old_key */
        put_ref(obj);
        return;
    }
    use(obj->value); /* USING STALE obj->value */

                     obj->value = new_value; /* reordered store */
                     add(collection, key, obj);

[surenb@google.com: fix title underlines in refcount-vs-atomic.rst]
  Link: https://lkml.kernel.org/r/20250217161645.3137927-1-surenb@google.com
Link: https://lkml.kernel.org/r/20250213224655.1680278-11-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>	[slab]
Tested-by: Shivank Garg <shivankg@amd.com>
  Link: https://lkml.kernel.org/r/5e19ec93-8307-47c2-bb13-3ddf7150624e@amd.com
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-03-16 22:06:19 -07:00
Tamir Duberstein
7a79e7daa8 printf: convert self-test to KUnit 
Convert the printf() self-test to a KUnit test.

In the interest of keeping the patch reasonably-sized this doesn't
refactor the tests into proper parameterized tests - it's all one big
test case.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20250307-printf-kunit-convert-v6-1-4d85c361c241@gmail.com
Signed-off-by: Kees Cook <kees@kernel.org>
 2025-03-13 10:26:33 -07:00
Yu-Chun Lin
364469e533 Documentation/core-api: min_heap: update for variable types change 
Update the documentation to reflect the change in variable types of
'nr' and 'size' from 'int' to 'size_t', ensuring consistency with
commit dec6c0aac4 ("lib min_heap: Switch to size_t").

Signed-off-by: Yu-Chun Lin <eleanor15x@gmail.com>
Acked-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250215155421.2010336-1-eleanor15x@gmail.com
 2025-02-18 13:30:56 -07:00
Paul E. McKenney
df0cee4311 docs: Improve discussion of this_cpu_ptr(), add raw_cpu_ptr() 
Most of the this_cpu_*() operations may be used in preemptible code,
but not this_cpu_ptr(), and for good reasons.  Therefore, better explain
the reasons and call out raw_cpu_ptr() as an alternative in certain very
special cases.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: <linux-doc@vger.kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
 2025-02-04 21:50:06 -08:00
Linus Torvalds
c159dfbdd4 Mainly individually changelogged singleton patches. The patch series in 
this pull are:
 
 - "lib min_heap: Improve min_heap safety, testing, and documentation"
   from Kuan-Wei Chiu provides various tightenings to the min_heap library
   code.
 
 - "xarray: extract __xa_cmpxchg_raw" from Tamir Duberstein preforms some
   cleanup and Rust preparation in the xarray library code.
 
 - "Update reference to include/asm-<arch>" from Geert Uytterhoeven fixes
   pathnames in some code comments.
 
 - "Converge on using secs_to_jiffies()" from Easwar Hariharan uses the
   new secs_to_jiffies() in various places where that is appropriate.
 
 - "ocfs2, dlmfs: convert to the new mount API" from Eric Sandeen
   switches two filesystems to the new mount API.
 
 - "Convert ocfs2 to use folios" from Matthew Wilcox does that.
 
 - "Remove get_task_comm() and print task comm directly" from Yafang Shao
   removes now-unneeded calls to get_task_comm() in various places.
 
 - "squashfs: reduce memory usage and update docs" from Phillip Lougher
   implements some memory savings in squashfs and performs some
   maintainability work.
 
 - "lib: clarify comparison function requirements" from Kuan-Wei Chiu
   tightens the sort code's behaviour and adds some maintenance work.
 
 - "nilfs2: protect busy buffer heads from being force-cleared" from
   Ryusuke Konishi fixes an issues in nlifs when the fs is presented with a
   corrupted image.
 
 - "nilfs2: fix kernel-doc comments for function return values" from
   Ryusuke Konishi fixes some nilfs kerneldoc.
 
 - "nilfs2: fix issues with rename operations" from Ryusuke Konishi
   addresses some nilfs BUG_ONs which syzbot was able to trigger.
 
 - "minmax.h: Cleanups and minor optimisations" from David Laight
   does some maintenance work on the min/max library code.
 
 - "Fixes and cleanups to xarray" from Kemeng Shi does maintenance work
   on the xarray library code.
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Merge tag 'mm-nonmm-stable-2025-01-24-23-16' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:
 "Mainly individually changelogged singleton patches. The patch series
  in this pull are:

   - "lib min_heap: Improve min_heap safety, testing, and documentation"
     from Kuan-Wei Chiu provides various tightenings to the min_heap
     library code

   - "xarray: extract __xa_cmpxchg_raw" from Tamir Duberstein preforms
     some cleanup and Rust preparation in the xarray library code

   - "Update reference to include/asm-<arch>" from Geert Uytterhoeven
     fixes pathnames in some code comments

   - "Converge on using secs_to_jiffies()" from Easwar Hariharan uses
     the new secs_to_jiffies() in various places where that is
     appropriate

   - "ocfs2, dlmfs: convert to the new mount API" from Eric Sandeen
     switches two filesystems to the new mount API

   - "Convert ocfs2 to use folios" from Matthew Wilcox does that

   - "Remove get_task_comm() and print task comm directly" from Yafang
     Shao removes now-unneeded calls to get_task_comm() in various
     places

   - "squashfs: reduce memory usage and update docs" from Phillip
     Lougher implements some memory savings in squashfs and performs
     some maintainability work

   - "lib: clarify comparison function requirements" from Kuan-Wei Chiu
     tightens the sort code's behaviour and adds some maintenance work

   - "nilfs2: protect busy buffer heads from being force-cleared" from
     Ryusuke Konishi fixes an issues in nlifs when the fs is presented
     with a corrupted image

   - "nilfs2: fix kernel-doc comments for function return values" from
     Ryusuke Konishi fixes some nilfs kerneldoc

   - "nilfs2: fix issues with rename operations" from Ryusuke Konishi
     addresses some nilfs BUG_ONs which syzbot was able to trigger

   - "minmax.h: Cleanups and minor optimisations" from David Laight does
     some maintenance work on the min/max library code

   - "Fixes and cleanups to xarray" from Kemeng Shi does maintenance
     work on the xarray library code"

* tag 'mm-nonmm-stable-2025-01-24-23-16' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (131 commits)
  ocfs2: use str_yes_no() and str_no_yes() helper functions
  include/linux/lz4.h: add some missing macros
  Xarray: use xa_mark_t in xas_squash_marks() to keep code consistent
  Xarray: remove repeat check in xas_squash_marks()
  Xarray: distinguish large entries correctly in xas_split_alloc()
  Xarray: move forward index correctly in xas_pause()
  Xarray: do not return sibling entries from xas_find_marked()
  ipc/util.c: complete the kernel-doc function descriptions
  gcov: clang: use correct function param names
  latencytop: use correct kernel-doc format for func params
  minmax.h: remove some #defines that are only expanded once
  minmax.h: simplify the variants of clamp()
  minmax.h: move all the clamp() definitions after the min/max() ones
  minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
  minmax.h: reduce the #define expansion of min(), max() and clamp()
  minmax.h: update some comments
  minmax.h: add whitespace around operators and after commas
  nilfs2: do not update mtime of renamed directory that is not moved
  nilfs2: handle errors that nilfs_prepare_chunk() may return
  CREDITS: fix spelling mistake
  ...
 2025-01-26 17:50:53 -08:00
Linus Torvalds
0ad9617c78 Networking changes for 6.14. 
Core
 ----
 
  - More core refactoring to reduce the RTNL lock contention,
    including preparatory work for the per-network namespace RTNL lock,
    replacing RTNL lock with a per device-one to protect NAPI-related
    net device data and moving synchronize_net() calls outside such
    lock.
 
  - Extend drop reasons usage, adding net scheduler, AF_UNIX, bridge and
    more specific TCP coverage.
 
  - Reduce network namespace tear-down time by removing per-subsystems
    synchronize_net() in tipc and sched.
 
  - Add flow label selector support for fib rules, allowing traffic
    redirection based on such header field.
 
 Netfilter
 ---------
 
  - Do not remove netdev basechain when last device is gone, allowing
    netdev basechains without devices.
 
  - Revisit the flowtable teardown strategy, dealing better with fin,
    reset and re-open events.
 
  - Scale-up IP-vs connection dumping by avoiding linear search on
    each restart.
 
 Protocols
 ---------
 
  - A significant XDP socket refactor, consolidating and optimizing
    several helpers into the core
 
  - Better scaling of ICMP rate-limiting, by removing false-sharing in
    inet peers handling.
 
  - Introduces netlink notifications for multicast IPv4 and IPv6
    address changes.
 
  - Add ipsec support for IP-TFS/AggFrag encapsulation, allowing
    aggregation and fragmentation of the inner IP.
 
  - Add sysctl to configure TIME-WAIT reuse delay for TCP sockets,
    to avoid local port exhaustion issues when the average connection
    lifetime is very short.
 
  - Support updating keys (re-keying) for connections using kernel
    TLS (for TLS 1.3 only).
 
  - Support ipv4-mapped ipv6 address clients in smc-r v2.
 
  - Add support for jumbo data packet transmission in RxRPC sockets,
    gluing multiple data packets in a single UDP packet.
 
  - Support RxRPC RACK-TLP to manage packet loss and retransmission in
    conjunction with the congestion control algorithm.
 
 Driver API
 ----------
 
  - Introduce a unified and structured interface for reporting PHY
    statistics, exposing consistent data across different H/W via
    ethtool.
 
  - Make timestamping selectable, allow the user to select the desired
    hwtstamp provider (PHY or MAC) administratively.
 
  - Add support for configuring a header-data-split threshold (HDS)
    value via ethtool, to deal with partial or buggy H/W implementation.
 
  - Consolidate DSA drivers Energy Efficiency Ethernet support.
 
  - Add EEE management to phylink, making use of the phylib
    implementation.
 
  - Add phylib support for in-band capabilities negotiation.
 
  - Simplify how phylib-enabled mac drivers expose the supported
    interfaces.
 
 Tests and tooling
 -----------------
 
  - Make the YNL tool package-friendly to make it easier to deploy it
    separately from the kernel.
 
  - Increase TCP selftest coverage importing several packetdrill
    test-cases.
 
  - Regenerate the ethtool uapi header from the YNL spec,
    to ease maintenance and future development.
 
  - Add YNL support for decoding the link types used in net
    self-tests, allowing a single build to run both net and
    drivers/net.
 
 Drivers
 -------
 
  - Ethernet high-speed NICs:
    - nVidia/Mellanox (mlx5):
      - add cross E-Switch QoS support
      - add SW Steering support for ConnectX-8
      - implement support for HW-Managed Flow Steering, improving the
        rule deletion/insertion rate
      - support for multi-host LAG
    - Intel (ixgbe, ice, igb):
      - ice: add support for devlink health events
      - ixgbe: add initial support for E610 chipset variant
      - igb: add support for AF_XDP zero-copy
    - Meta:
      - add support for basic RSS config
      - allow changing the number of channels
      - add hardware monitoring support
    - Broadcom (bnxt):
      - implement TCP data split and HDS threshold ethtool support,
        enabling Device Memory TCP.
    - Marvell Octeon:
      - implement egress ipsec offload support for the cn10k family
    - Hisilicon (HIBMC):
      - implement unicast MAC filtering
 
  - Ethernet NICs embedded and virtual:
    - Convert UDP tunnel drivers to NETDEV_PCPU_STAT_DSTATS, avoiding
      contented atomic operations for drop counters
    - Freescale:
      - quicc: phylink conversion
      - enetc: support Tx and Rx checksum offload and improve TSO
        performances
    - MediaTek:
      - airoha: introduce support for ETS and HTB Qdisc offload
    - Microchip:
      - lan78XX USB: preparation work for phylink conversion
    - Synopsys (stmmac):
      - support DWMAC IP on NXP Automotive SoCs S32G2xx/S32G3xx/S32R45
      - refactor EEE support to leverage the new driver API
      - optimize DMA and cache access to increase raw RX performances
        by 40%
    - TI:
      - icssg-prueth: add multicast filtering support for VLAN
        interface
    - netkit:
      - add ability to configure head/tailroom
    - VXLAN:
      - accepts packets with user-defined reserved bit
 
  - Ethernet switches:
    - Microchip:
      - lan969x: add RGMII support
      - lan969x: improve TX and RX performance using the FDMA engine
    - nVidia/Mellanox:
      - move Tx header handling to PCI driver, to ease XDP support
 
  - Ethernet PHYs:
    - Texas Instruments DP83822:
      - add support for GPIO2 clock output
    - Realtek:
      - 8169: add support for RTL8125D rev.b
      - rtl822x: add hwmon support for the temperature sensor
    - Microchip:
      - add support for RDS PTP hardware
      - consolidate periodic output signal generation
 
  - CAN:
    - several DT-bindings to DT schema conversions
    - tcan4x5x:
      - add HW standby support
      - support nWKRQ voltage selection
    - kvaser:
      - allowing Bus Error Reporting runtime configuration
 
  - WiFi:
    - the on-going Multi-Link Operation (MLO) effort continues, affecting
      both the stack and in drivers
    - mac80211/cfg80211:
      - Emergency Preparedness Communication Services (EPCS) station mode
        support
      - support for adding and removing station links for MLO
      - add support for WiFi 7/EHT mesh over 320 MHz channels
      - report Tx power info for each link
    - RealTek (rtw88):
      - enable USB Rx aggregation and USB 3 to improve performance
      - LED support
    - RealTek (rtw89):
      - refactor power save to support Multi-Link Operations
      - add support for RTL8922AE-VS variant
    - MediaTek (mt76):
      - single wiphy multiband support (preparation for MLO)
      - p2p device support
      - add TP-Link TXE50UH USB adapter support
    - Qualcomm (ath10k):
      - support for the QCA6698AQ IP core
    - Qualcomm (ath12k):
      - enable MLO for QCN9274
 
  - Bluetooth:
    - Allow sysfs to trigger hdev reset, to allow recovering devices
      not responsive from user-space
    - MediaTek: add support for MT7922, MT7925, MT7921e devices
    - Realtek: add support for RTL8851BE devices
    - Qualcomm: add support for WCN785x devices
    - ISO: allow BIG re-sync
 
 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Merge tag 'net-next-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Paolo Abeni:
 "This is slightly smaller than usual, with the most interesting work
  being still around RTNL scope reduction.

  Core:

   - More core refactoring to reduce the RTNL lock contention, including
     preparatory work for the per-network namespace RTNL lock, replacing
     RTNL lock with a per device-one to protect NAPI-related net device
     data and moving synchronize_net() calls outside such lock.

   - Extend drop reasons usage, adding net scheduler, AF_UNIX, bridge
     and more specific TCP coverage.

   - Reduce network namespace tear-down time by removing per-subsystems
     synchronize_net() in tipc and sched.

   - Add flow label selector support for fib rules, allowing traffic
     redirection based on such header field.

  Netfilter:

   - Do not remove netdev basechain when last device is gone, allowing
     netdev basechains without devices.

   - Revisit the flowtable teardown strategy, dealing better with fin,
     reset and re-open events.

   - Scale-up IP-vs connection dumping by avoiding linear search on each
     restart.

  Protocols:

   - A significant XDP socket refactor, consolidating and optimizing
     several helpers into the core

   - Better scaling of ICMP rate-limiting, by removing false-sharing in
     inet peers handling.

   - Introduces netlink notifications for multicast IPv4 and IPv6
     address changes.

   - Add ipsec support for IP-TFS/AggFrag encapsulation, allowing
     aggregation and fragmentation of the inner IP.

   - Add sysctl to configure TIME-WAIT reuse delay for TCP sockets, to
     avoid local port exhaustion issues when the average connection
     lifetime is very short.

   - Support updating keys (re-keying) for connections using kernel TLS
     (for TLS 1.3 only).

   - Support ipv4-mapped ipv6 address clients in smc-r v2.

   - Add support for jumbo data packet transmission in RxRPC sockets,
     gluing multiple data packets in a single UDP packet.

   - Support RxRPC RACK-TLP to manage packet loss and retransmission in
     conjunction with the congestion control algorithm.

  Driver API:

   - Introduce a unified and structured interface for reporting PHY
     statistics, exposing consistent data across different H/W via
     ethtool.

   - Make timestamping selectable, allow the user to select the desired
     hwtstamp provider (PHY or MAC) administratively.

   - Add support for configuring a header-data-split threshold (HDS)
     value via ethtool, to deal with partial or buggy H/W
     implementation.

   - Consolidate DSA drivers Energy Efficiency Ethernet support.

   - Add EEE management to phylink, making use of the phylib
     implementation.

   - Add phylib support for in-band capabilities negotiation.

   - Simplify how phylib-enabled mac drivers expose the supported
     interfaces.

  Tests and tooling:

   - Make the YNL tool package-friendly to make it easier to deploy it
     separately from the kernel.

   - Increase TCP selftest coverage importing several packetdrill
     test-cases.

   - Regenerate the ethtool uapi header from the YNL spec, to ease
     maintenance and future development.

   - Add YNL support for decoding the link types used in net self-tests,
     allowing a single build to run both net and drivers/net.

  Drivers:

   - Ethernet high-speed NICs:
      - nVidia/Mellanox (mlx5):
         - add cross E-Switch QoS support
         - add SW Steering support for ConnectX-8
         - implement support for HW-Managed Flow Steering, improving the
           rule deletion/insertion rate
         - support for multi-host LAG
      - Intel (ixgbe, ice, igb):
         - ice: add support for devlink health events
         - ixgbe: add initial support for E610 chipset variant
         - igb: add support for AF_XDP zero-copy
      - Meta:
         - add support for basic RSS config
         - allow changing the number of channels
         - add hardware monitoring support
      - Broadcom (bnxt):
         - implement TCP data split and HDS threshold ethtool support,
           enabling Device Memory TCP.
      - Marvell Octeon:
         - implement egress ipsec offload support for the cn10k family
      - Hisilicon (HIBMC):
         - implement unicast MAC filtering

   - Ethernet NICs embedded and virtual:
      - Convert UDP tunnel drivers to NETDEV_PCPU_STAT_DSTATS, avoiding
        contented atomic operations for drop counters
      - Freescale:
         - quicc: phylink conversion
         - enetc: support Tx and Rx checksum offload and improve TSO
           performances
      - MediaTek:
         - airoha: introduce support for ETS and HTB Qdisc offload
      - Microchip:
         - lan78XX USB: preparation work for phylink conversion
      - Synopsys (stmmac):
         - support DWMAC IP on NXP Automotive SoCs S32G2xx/S32G3xx/S32R45
         - refactor EEE support to leverage the new driver API
         - optimize DMA and cache access to increase raw RX performances
           by 40%
      - TI:
         - icssg-prueth: add multicast filtering support for VLAN
           interface
      - netkit:
         - add ability to configure head/tailroom
      - VXLAN:
         - accepts packets with user-defined reserved bit

   - Ethernet switches:
      - Microchip:
         - lan969x: add RGMII support
         - lan969x: improve TX and RX performance using the FDMA engine
      - nVidia/Mellanox:
         - move Tx header handling to PCI driver, to ease XDP support

   - Ethernet PHYs:
      - Texas Instruments DP83822:
         - add support for GPIO2 clock output
      - Realtek:
         - 8169: add support for RTL8125D rev.b
         - rtl822x: add hwmon support for the temperature sensor
      - Microchip:
         - add support for RDS PTP hardware
         - consolidate periodic output signal generation

   - CAN:
      - several DT-bindings to DT schema conversions
      - tcan4x5x:
         - add HW standby support
         - support nWKRQ voltage selection
      - kvaser:
         - allowing Bus Error Reporting runtime configuration

   - WiFi:
      - the on-going Multi-Link Operation (MLO) effort continues,
        affecting both the stack and in drivers
      - mac80211/cfg80211:
         - Emergency Preparedness Communication Services (EPCS) station
           mode support
         - support for adding and removing station links for MLO
         - add support for WiFi 7/EHT mesh over 320 MHz channels
         - report Tx power info for each link
      - RealTek (rtw88):
         - enable USB Rx aggregation and USB 3 to improve performance
         - LED support
      - RealTek (rtw89):
         - refactor power save to support Multi-Link Operations
         - add support for RTL8922AE-VS variant
      - MediaTek (mt76):
         - single wiphy multiband support (preparation for MLO)
         - p2p device support
         - add TP-Link TXE50UH USB adapter support
      - Qualcomm (ath10k):
         - support for the QCA6698AQ IP core
      - Qualcomm (ath12k):
         - enable MLO for QCN9274

   - Bluetooth:
      - Allow sysfs to trigger hdev reset, to allow recovering devices
        not responsive from user-space
      - MediaTek: add support for MT7922, MT7925, MT7921e devices
      - Realtek: add support for RTL8851BE devices
      - Qualcomm: add support for WCN785x devices
      - ISO: allow BIG re-sync"

* tag 'net-next-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1386 commits)
  net/rose: prevent integer overflows in rose_setsockopt()
  net: phylink: fix regression when binding a PHY
  net: ethernet: ti: am65-cpsw: streamline TX queue creation and cleanup
  net: ethernet: ti: am65-cpsw: streamline RX queue creation and cleanup
  net: ethernet: ti: am65-cpsw: ensure proper channel cleanup in error path
  ipv6: Convert inet6_rtm_deladdr() to per-netns RTNL.
  ipv6: Convert inet6_rtm_newaddr() to per-netns RTNL.
  ipv6: Move lifetime validation to inet6_rtm_newaddr().
  ipv6: Set cfg.ifa_flags before device lookup in inet6_rtm_newaddr().
  ipv6: Pass dev to inet6_addr_add().
  ipv6: Convert inet6_ioctl() to per-netns RTNL.
  ipv6: Hold rtnl_net_lock() in addrconf_init() and addrconf_cleanup().
  ipv6: Hold rtnl_net_lock() in addrconf_dad_work().
  ipv6: Hold rtnl_net_lock() in addrconf_verify_work().
  ipv6: Convert net.ipv6.conf.${DEV}.XXX sysctl to per-netns RTNL.
  ipv6: Add __in6_dev_get_rtnl_net().
  net: stmmac: Drop redundant skb_mark_for_recycle() for SKB frags
  net: mii: Fix the Speed display when the network cable is not connected
  sysctl net: Remove macro checks for CONFIG_SYSCTL
  eth: bnxt: update header sizing defaults
  ...
 2025-01-22 08:28:57 -08:00
Linus Torvalds
d0f93ac2c3 Documentation changes this time around include: 
- Quite a bit of Chinese and Spanish translation work.
 
 - Clarifying that Git commit IDs >12chars are OK
 
 - A new nvme-multipath document
 
 - A reorganization of the admin-guide top-level page to make it readable
 
 - Clarification of the role of Acked-by and maintainer discretion on their
   acceptance.
 
 - Some reorganization of debugging-oriented docs.
 
 ...and typo fixes, documentation updates, etc. as usual.
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Merge tag 'docs-6.14' of git://git.lwn.net/linux

Pull Documentation updates from Jonathan Corbet:

 - Quite a bit of Chinese and Spanish translation work

 - Clarifying that Git commit IDs >12chars are OK

 - A new nvme-multipath document

 - A reorganization of the admin-guide top-level page to make it
   readable

 - Clarification of the role of Acked-by and maintainer discretion on
   their acceptance

 - Some reorganization of debugging-oriented docs

... and typo fixes, documentation updates, etc as usual

* tag 'docs-6.14' of git://git.lwn.net/linux: (50 commits)
  Documentation: Fix x86_64 UEFI outdated references to elilo
  Documentation/sysctl: Add timer_migration to kernel.rst
  docs/mm: Physical memory: Remove zone_t
  docs: submitting-patches: clarify that signers may use their discretion on tags
  docs: submitting-patches: clarify difference between Acked-by and Reviewed-by
  docs: submitting-patches: clarify Acked-by and introduce "# Suffix"
  Documentation: bug-hunting.rst: remove odd contact information
  docs/zh_CN: Add sak index Chinese translation
  doc: module: DEFAULT_SYMBOL_NAMESPACE must be defined before #includes
  doc: module: Fix documented type of namespace
  Documentation/kernel-parameters: Fix a reference to vga-softcursor.rst
  docs/zh_CN: Add landlock index Chinese translation
  Documentation: Fix typo localmodonfig -> localmodconfig
  overlayfs.rst: Fix and improve grammar
  docs/zh_CN: Add siphash index Chinese translation
  docs/zh_CN: Add security IMA-templates Chinese translation
  docs/zh_CN: Add security digsig Chinese translation
  Align git commit ID abbreviation guidelines and checks
  docs: process: submitting-patches: split canonical patch format section
  docs/zh_CN: Add security lsm Chinese translation
  ...
 2025-01-21 18:00:00 -08:00
Maxime Ripard
79c4b4f431
doc/cgroup: Fix title underline length 
Commit b168ed458d ("kernel/cgroup: Add "dmem" memory accounting
cgroup") introduced a new documentation file, with a shorter than
expected underline. This results in a documentation build warning. Fix
that underline length.

Fixes: b168ed458d ("kernel/cgroup: Add "dmem" memory accounting cgroup")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/r/20250113154611.624256bf@canb.auug.org.au/
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20250113092608.1349287-4-mripard@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>
 2025-01-15 09:46:18 +01:00
Tamir Duberstein
eb7a18ebd6 XArray: minor documentation improvements 
- Replace "they" with "you" where "you" is used in the preceding
  sentence fragment.
- Mention `xa_erase` in discussion of multi-index entries.  Split this
  into a separate sentence.
- Add "call" parentheses on "xa_store" for consistency and
  linkification.
- Add caveat that `xa_store` and `xa_erase` are not equivalent in the
  presence of `XA_FLAGS_ALLOC`.

Link: https://lkml.kernel.org/r/20241105-xarray-documentation-v5-1-8e1702321b41@gmail.com
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-01-12 20:21:08 -08:00
Kuan-Wei Chiu
b9da6f70e0 Documentation/core-api: min_heap: add author information 
As with other documentation files, author information is added to
min_heap.rst, providing contact details for any questions regarding the
Min Heap API or the document itself.

Link: https://lkml.kernel.org/r/20241129181222.646855-5-visitorckw@gmail.com
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Cc: Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2025-01-12 20:20:57 -08:00
Uwe Kleine-König
fcf22a957f doc: module: DEFAULT_SYMBOL_NAMESPACE must be defined before #includes 
The definition of EXPORT_SYMBOL et al depends on
DEFAULT_SYMBOL_NAMESPACE. So DEFAULT_SYMBOL_NAMESPACE must already be
available when <linux/export.h> is parsed.

Also when defined that early there is no need for an #undef, so drop
that from the usage example.

Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/linux-i2c/Z09bp9uMzwXRLXuF@smile.fi.intel.com/
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/3dd7ff6fa0a636de86e091286016be8c90e03631.1733305665.git.ukleinek@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241230142357.3203913-6-u.kleine-koenig@baylibre.com
 2025-01-09 12:36:55 -07:00
Uwe Kleine-König
3008178ef3 doc: module: Fix documented type of namespace 
Since commit cdd30ebb1b ("module: Convert symbol namespace to string
literal") the namespace has to be a string. Fix accordingly.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/6fe15069c01b31aaa68c6224bec2df9f4a449858.1733305665.git.ukleinek@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241230142357.3203913-5-u.kleine-koenig@baylibre.com
 2025-01-09 12:36:55 -07:00
Maarten Lankhorst
b168ed458d
kernel/cgroup: Add "dmem" memory accounting cgroup 
This code is based on the RDMA and misc cgroup initially, but now
uses page_counter. It uses the same min/low/max semantics as the memory
cgroup as a result.

There's a small mismatch as TTM uses u64, and page_counter long pages.
In practice it's not a problem. 32-bits systems don't really come with
>=4GB cards and as long as we're consistently wrong with units, it's
fine. The device page size may not be in the same units as kernel page
size, and each region might also have a different page size (VRAM vs GART
for example).

The interface is simple:
- Call dmem_cgroup_register_region()
- Use dmem_cgroup_try_charge to check if you can allocate a chunk of memory,
  use dmem_cgroup__uncharge when freeing it. This may return an error code,
  or -EAGAIN when the cgroup limit is reached. In that case a reference
  to the limiting pool is returned.
- The limiting cs can be used as compare function for
  dmem_cgroup_state_evict_valuable.
- After having evicted enough, drop reference to limiting cs with
  dmem_cgroup_pool_state_put.

This API allows you to limit device resources with cgroups.
You can see the supported cards in /sys/fs/cgroup/dmem.capacity
You need to echo +dmem to cgroup.subtree_control, and then you can
partition device memory.

Co-developed-by: Friedrich Vock <friedrich.vock@gmx.de>
Signed-off-by: Friedrich Vock <friedrich.vock@gmx.de>
Co-developed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20241204143112.1250983-1-dev@lankhorst.se
Signed-off-by: Maxime Ripard <mripard@kernel.org>
 2025-01-06 17:24:38 +01:00
Matthew Wilcox (Oracle)
b76d32422c kref: Improve documentation 
There is already kernel-doc written for many of the functions in kref.h
but it's not linked into the html docs anywhere.  Add it to kref.rst.

Improve the kref documentation by using the standard Return: section,
rewording some unclear verbiage and adding docs for some undocumented
functions.

Update Thomas' email address to his current one.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241209160953.757673-1-willy@infradead.org
 2024-12-13 08:49:31 -07:00
Jacob Keller
a9ad2a8dfb lib: packing: document recently added APIs 
Extend the documentation for the packing library, covering the intended use
for the recently added APIs. This includes the pack() and unpack() macros,
as well as the pack_fields() and unpack_fields() macros.

Add a note that the packing() API is now deprecated in favor of pack() and
unpack().

For the pack_fields() and unpack_fields() APIs, explain the rationale for
when a driver may want to select this API. Provide an example which shows
how to define the fields and call the pack_fields() and unpack_fields()
macros.

Co-developed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20241210-packing-pack-fields-and-ice-implementation-v10-4-ee56a47479ac@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 2024-12-11 20:13:00 -08:00
Randy Dunlap
28884915e6 Documentation: core-api: add generic parser docbook 
Add the simple generic parser to the core-api docbook.
It can be used for parsing all sorts of options throughout the kernel.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241120060711.159783-1-rdunlap@infradead.org
 2024-12-11 09:07:40 -07:00
Masahiro Yamada
ceb8bf2cea module: Convert default symbol namespace to string literal 
Commit cdd30ebb1b ("module: Convert symbol namespace to string
literal") only converted MODULE_IMPORT_NS() and EXPORT_SYMBOL_NS(),
leaving DEFAULT_SYMBOL_NAMESPACE as a macro expansion.

This commit converts DEFAULT_SYMBOL_NAMESPACE in the same way to avoid
annoyance for the default namespace as well.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2024-12-03 08:22:25 -08:00
Masahiro Yamada
3727b1a7ca doc: module: revert misconversions for MODULE_IMPORT_NS() 
This reverts the misconversions introduced by commit cdd30ebb1b
("module: Convert symbol namespace to string literal").

The affected descriptions refer to MODULE_IMPORT_NS() tags in general,
rather than suggesting the use of the empty string ("") as the
namespace.

Fixes: cdd30ebb1b ("module: Convert symbol namespace to string literal")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2024-12-03 08:22:25 -08:00
Peter Zijlstra
cdd30ebb1b module: Convert symbol namespace to string literal 
Clean up the existing export namespace code along the same lines of
commit 33def8498f ("treewide: Convert macro and uses of __section(foo)
to __section("foo")") and for the same reason, it is not desired for the
namespace argument to be a macro expansion itself.

Scripted using

  git grep -l -e MODULE_IMPORT_NS -e EXPORT_SYMBOL_NS | while read file;
  do
    awk -i inplace '
      /^#define EXPORT_SYMBOL_NS/ {
        gsub(/__stringify\(ns\)/, "ns");
        print;
        next;
      }
      /^#define MODULE_IMPORT_NS/ {
        gsub(/__stringify\(ns\)/, "ns");
        print;
        next;
      }
      /MODULE_IMPORT_NS/ {
        $0 = gensub(/MODULE_IMPORT_NS\(([^)]*)\)/, "MODULE_IMPORT_NS(\"\\1\")", "g");
      }
      /EXPORT_SYMBOL_NS/ {
        if ($0 ~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+),/) {
  	if ($0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/ &&
  	    $0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(\)/ &&
  	    $0 !~ /^my/) {
  	  getline line;
  	  gsub(/[[:space:]]*\\$/, "");
  	  gsub(/[[:space:]]/, "", line);
  	  $0 = $0 " " line;
  	}

  	$0 = gensub(/(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/,
  		    "\\1(\\2, \"\\3\")", "g");
        }
      }
      { print }' $file;
  done

Requested-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://mail.google.com/mail/u/2/#inbox/FMfcgzQXKWgMmjdFwwdsfgxzKpVHWPlc
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2024-12-02 11:34:44 -08:00
Linus Torvalds
e68ce9474a A few late-arriving fixes, plus two more significant changes that were 
*almost* ready at the beginning of the merge window:
 
 - A new document on debugging techniques from Sebastian Fricke
 
 - A clarification on MODULE_LICENSE terms meant to head off the sort of
   confusion that led to the recent Tuxedo Computers mess.
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Merge tag 'docs-6.13-2' of git://git.lwn.net/linux

Pull more documentation updates from Jonathan Corbet:
 "A few late-arriving fixes, plus two more significant changes that were
  *almost* ready at the beginning of the merge window:

   - A new document on debugging techniques from Sebastian Fricke

   - A clarification on MODULE_LICENSE terms meant to head off the sort
     of confusion that led to the recent Tuxedo Computers mess"

* tag 'docs-6.13-2' of git://git.lwn.net/linux:
  docs: Add debugging guide for the media subsystem
  docs: Add debugging section to process
  docs/licensing: Clarify wording about "GPL" and "Proprietary"
  docs: core-api/gfp_mask-from-fs-io: indicate that vmalloc supports GFP_NOFS/GFP_NOIO
  Documentation: kernel-doc: enumerate identifier *type*s
  Documentation: pwrseq: Fix trivial misspellings
  Documentation: filesystems: update filename extensions
 2024-11-26 13:44:27 -08:00
Linus Torvalds
f5f4745a7f - The series "resource: A couple of cleanups" from Andy Shevchenko 
performs some cleanups in the resource management code.
 
 - The series "Improve the copy of task comm" from Yafang Shao addresses
   possible race-induced overflows in the management of task_struct.comm[].
 
 - The series "Remove unnecessary header includes from
   {tools/}lib/list_sort.c" from Kuan-Wei Chiu adds some cleanups and a
   small fix to the list_sort library code and to its selftest.
 
 - The series "Enhance min heap API with non-inline functions and
   optimizations" also from Kuan-Wei Chiu optimizes and cleans up the
   min_heap library code.
 
 - The series "nilfs2: Finish folio conversion" from Ryusuke Konishi
   finishes off nilfs2's folioification.
 
 - The series "add detect count for hung tasks" from Lance Yang adds more
   userspace visibility into the hung-task detector's activity.
 
 - Apart from that, singelton patches in many places - please see the
   individual changelogs for details.
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Merge tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - The series "resource: A couple of cleanups" from Andy Shevchenko
   performs some cleanups in the resource management code

 - The series "Improve the copy of task comm" from Yafang Shao addresses
   possible race-induced overflows in the management of
   task_struct.comm[]

 - The series "Remove unnecessary header includes from
   {tools/}lib/list_sort.c" from Kuan-Wei Chiu adds some cleanups and a
   small fix to the list_sort library code and to its selftest

 - The series "Enhance min heap API with non-inline functions and
   optimizations" also from Kuan-Wei Chiu optimizes and cleans up the
   min_heap library code

 - The series "nilfs2: Finish folio conversion" from Ryusuke Konishi
   finishes off nilfs2's folioification

 - The series "add detect count for hung tasks" from Lance Yang adds
   more userspace visibility into the hung-task detector's activity

 - Apart from that, singelton patches in many places - please see the
   individual changelogs for details

* tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (71 commits)
  gdb: lx-symbols: do not error out on monolithic build
  kernel/reboot: replace sprintf() with sysfs_emit()
  lib: util_macros_kunit: add kunit test for util_macros.h
  util_macros.h: fix/rework find_closest() macros
  Improve consistency of '#error' directive messages
  ocfs2: fix uninitialized value in ocfs2_file_read_iter()
  hung_task: add docs for hung_task_detect_count
  hung_task: add detect count for hung tasks
  dma-buf: use atomic64_inc_return() in dma_buf_getfile()
  fs/proc/kcore.c: fix coccinelle reported ERROR instances
  resource: avoid unnecessary resource tree walking in __region_intersects()
  ocfs2: remove unused errmsg function and table
  ocfs2: cluster: fix a typo
  lib/scatterlist: use sg_phys() helper
  checkpatch: always parse orig_commit in fixes tag
  nilfs2: convert metadata aops from writepage to writepages
  nilfs2: convert nilfs_recovery_copy_block() to take a folio
  nilfs2: convert nilfs_page_count_clean_buffers() to take a folio
  nilfs2: remove nilfs_writepage
  nilfs2: convert checkpoint file to be folio-based
  ...
 2024-11-25 16:09:48 -08:00
Linus Torvalds
563cb0b1e7 cxl changes for v6.13 
- Constify range_contains() input parameters to prevent changes.
 - Add support for displaying RCD capabilities in sysfs to support lspci for CXL device.
 - Downgrade warning message to debug in cxl_probe_component_regs().
 - Add support for adding a printf specifier '$pra' to emit 'struct range' content.
   - Add sanity tests for 'struct resource'.
   - Add documentation for special case.
   - Add %pra for 'struct range'.
   - Add %pra usage in CXL code.
 - Add preparation code for DCD support
   - Add range_overlaps().
   - Add CDAT DSMAS table shared and read only flag in ACPICA.
   - Add documentation to 'struct dev_dax_range'.
   - Delay event buffer allocation in CXL PCI code until needed.
   - Use guard() in cxl_dpa_set_mode().
   - Refactor create region code to consolidate common code.
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Merge tag 'cxl-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl

Pull cxl updates from Dave Jiang:

 - Constify range_contains() input parameters to prevent changes

 - Add support for displaying RCD capabilities in sysfs to support lspci
   for CXL device

 - Downgrade warning message to debug in cxl_probe_component_regs()

 - Add support for adding a printf specifier '%pra' to emit 'struct
   range' content:
     - Add sanity tests for 'struct resource'
     - Add documentation for special case
     - Add %pra for 'struct range'
     - Add %pra usage in CXL code

 - Add preparation code for DCD support:
     - Add range_overlaps()
     - Add CDAT DSMAS table shared and read only flag in ACPICA
     - Add documentation to 'struct dev_dax_range'
     - Delay event buffer allocation in CXL PCI code until needed
     - Use guard() in cxl_dpa_set_mode()
     - Refactor create region code to consolidate common code

* tag 'cxl-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl:
  cxl/region: Refactor common create region code
  cxl/hdm: Use guard() in cxl_dpa_set_mode()
  cxl/pci: Delay event buffer allocation
  dax: Document struct dev_dax_range
  ACPI/CDAT: Add CDAT/DSMAS shared and read only flag values
  range: Add range_overlaps()
  cxl/cdat: Use %pra for dpa range outputs
  printf: Add print format (%pra) for struct range
  Documentation/printf: struct resource add start == end special case
  test printf: Add very basic struct resource tests
  cxl: downgrade a warning message to debug level in cxl_probe_component_regs()
  cxl/pci: Add sysfs attribute for CXL 1.1 device link status
  cxl/core/regs: Add rcd_pcie_cap initialization
  kernel/range: Const-ify range_contains parameters
 2024-11-22 12:33:52 -08:00
Pavel Tikhomirov
21e500138b docs: core-api/gfp_mask-from-fs-io: indicate that vmalloc supports GFP_NOFS/GFP_NOIO 
After the commit 451769ebb7 ("mm/vmalloc: alloc GFP_NO{FS,IO} for
vmalloc") in v5.17 it is now safe to use GFP_NOFS/GFP_NOIO flags
in [k]vmalloc, let's reflect it in documentation.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241119093922.567138-1-ptikhomirov@virtuozzo.com
 2024-11-22 10:42:37 -07:00
Linus Torvalds
fcc79e1714 Networking changes for 6.13. 
The most significant set of changes is the per netns RTNL. The new
 behavior is disabled by default, regression risk should be contained.
 
 Notably the new config knob PTP_1588_CLOCK_VMCLOCK will inherit its
 default value from PTP_1588_CLOCK_KVM, as the first is intended to be
 a more reliable replacement for the latter.
 
 Core
 ----
 
  - Started a very large, in-progress, effort to make the RTNL lock
    scope per network-namespace, thus reducing the lock contention
    significantly in the containerized use-case, comprising:
    - RCU-ified some relevant slices of the FIB control path
    - introduce basic per netns locking helpers
    - namespacified the IPv4 address hash table
    - remove rtnl_register{,_module}() in favour of rtnl_register_many()
    - refactor rtnl_{new,del,set}link() moving as much validation as
      possible out of RTNL lock
    - convert all phonet doit() and dumpit() handlers to RCU
    - convert IPv4 addresses manipulation to per-netns RTNL
    - convert virtual interface creation to per-netns RTNL
    the per-netns lock infra is guarded by the CONFIG_DEBUG_NET_SMALL_RTNL
    knob, disabled by default ad interim.
 
  - Introduce NAPI suspension, to efficiently switching between busy
    polling (NAPI processing suspended) and normal processing.
 
  - Migrate the IPv4 routing input, output and control path from direct
    ToS usage to DSCP macros. This is a work in progress to make ECN
    handling consistent and reliable.
 
  - Add drop reasons support to the IPv4 rotue input path, allowing
    better introspection in case of packets drop.
 
  - Make FIB seqnum lockless, dropping RTNL protection for read
    access.
 
  - Make inet{,v6} addresses hashing less predicable.
 
  - Allow providing timestamp OPT_ID via cmsg, to correlate TX packets
    and timestamps
 
 Things we sprinkled into general kernel code
 --------------------------------------------
 
  - Add small file operations for debugfs, to reduce the struct ops size.
 
  - Refactoring and optimization for the implementation of page_frag API,
    This is a preparatory work to consolidate the page_frag
    implementation.
 
 Netfilter
 ---------
 
  - Optimize set element transactions to reduce memory consumption
 
  - Extended netlink error reporting for attribute parser failure.
 
  - Make legacy xtables configs user selectable, giving users
    the option to configure iptables without enabling any other config.
 
  - Address a lot of false-positive RCU issues, pointed by recent
    CI improvements.
 
 BPF
 ---
 
  - Put xsk sockets on a struct diet and add various cleanups. Overall,
    this helps to bump performance by 12% for some workloads.
 
  - Extend BPF selftests to increase coverage of XDP features in
    combination with BPF cpumap.
 
  - Optimize and homogenize bpf_csum_diff helper for all archs and also
    add a batch of new BPF selftests for it.
 
  - Extend netkit with an option to delegate skb->{mark,priority}
    scrubbing to its BPF program.
 
  - Make the bpf_get_netns_cookie() helper available also to tc(x) BPF
    programs.
 
 Protocols
 ---------
 
  - Introduces 4-tuple hash for connected udp sockets, speeding-up
    significantly connected sockets lookup.
 
  - Add a fastpath for some TCP timers that usually expires after close,
    the socket lock contention.
 
  - Add inbound and outbound xfrm state caches to speed up state lookups.
 
  - Avoid sending MPTCP advertisements on stale subflows, reducing
    risks on loosing them.
 
  - Make neighbours table flushing more scalable, maintaining per device
    neigh lists.
 
 Driver API
 ----------
 
  - Introduce a unified interface to configure transmission H/W shaping,
    and expose it to user-space via generic-netlink.
 
  - Add support for per-NAPI config via netlink. This makes napi
    configuration persistent across queues removal and re-creation.
    Requires driver updates, currently supported drivers are:
    nVidia/Mellanox mlx4 and mlx5, Broadcom brcm and Intel ice.
 
  - Add ethtool support for writing SFP / PHY firmware blocks.
 
  - Track RSS context allocation from ethtool core.
 
  - Implement support for mirroring to DSA CPU port, via TC mirror
    offload.
 
  - Consolidate FDB updates notification, to avoid duplicates on
    device-specific entries.
 
  - Expose DPLL clock quality level to the user-space.
 
  - Support master-slave PHY config via device tree.
 
 Tests and tooling
 -----------------
 
  - forwarding: introduce deferred commands, to simplify
    the cleanup phase
 
 Drivers
 -------
 
  - Updated several drivers - Amazon vNic, Google vNic, Microsoft vNic,
    Intel e1000e and Broadcom Tigon3 - to use netdev-genl to link the
    IRQs and queues to NAPI IDs, allowing busy polling and better
    introspection.
 
  - Ethernet high-speed NICs:
    - nVidia/Mellanox:
      - mlx5:
        - a large refactor to implement support for cross E-Switch
          scheduling
        - refactor H/W conter management to let it scale better
        - H/W GRO cleanups
    - Intel (100G, ice)::
      - adds support for ethtool reset
      - implement support for per TX queue H/W shaping
    - AMD/Solarflare:
      - implement per device queue stats support
    - Broadcom (bnxt):
      - improve wildcard l4proto on IPv4/IPv6 ntuple rules
    - Marvell Octeon:
      - Adds representor support for each Resource Virtualization Unit
        (RVU) device.
    - Hisilicon:
      - adds support for the BMC Gigabit Ethernet
    - IBM (EMAC):
      - driver cleanup and modernization
    - Cisco (VIC):
      - raise the queues number limit to 256
 
  - Ethernet virtual:
    - Google vNIC:
      - implements page pool support
    - macsec:
      - inherit lower device's features and TSO limits when offloading
    - virtio_net:
      - enable premapped mode by default
      - support for XDP socket(AF_XDP) zerocopy TX
    - wireguard:
      - set the TSO max size to be GSO_MAX_SIZE, to aggregate larger
        packets.
 
  - Ethernet NICs embedded and virtual:
    - Broadcom ASP:
      - enable software timestamping
    - Freescale:
      - add enetc4 PF driver
    - MediaTek: Airoha SoC:
      - implement BQL support
    - RealTek r8169:
      - enable TSO by default on r8168/r8125
      - implement extended ethtool stats
    - Renesas AVB:
      - enable TX checksum offload
    - Synopsys (stmmac):
      - support header splitting for vlan tagged packets
      - move common code for DWMAC4 and DWXGMAC into a separate FPE
        module.
      - Add the dwmac driver support for T-HEAD TH1520 SoC
    - Synopsys (xpcs):
      - driver refactor and cleanup
    - TI:
      - icssg_prueth: add VLAN offload support
    - Xilinx emaclite:
      - adds clock support
 
  - Ethernet switches:
    - Microchip:
      - implement support for the lan969x Ethernet switch family
      - add LAN9646 switch support to KSZ DSA driver
 
  - Ethernet PHYs:
    - Marvel: 88q2x: enable auto negotiation
    - Microchip: add support for LAN865X Rev B1 and LAN867X Rev C1/C2
 
  - PTP:
    - Add support for the Amazon virtual clock device
    - Add PtP driver for s390 clocks
 
  - WiFi:
    - mac80211
      - EHT 1024 aggregation size for transmissions
      - new operation to indicate that a new interface is to be added
      - support radio separation of multi-band devices
      - move wireless extension spy implementation to libiw
    - Broadcom:
      - brcmfmac: optional LPO clock support
    - Microchip:
      - add support for Atmel WILC3000
    - Qualcomm (ath12k):
      - firmware coredump collection support
      - add debugfs support for a multitude of statistics
    - Qualcomm (ath5k):
      -  Arcadyan ARV45XX AR2417 & Gigaset SX76[23] AR241[34]A support
    - Realtek:
      - rtw88: 8821au and 8812au USB adapters support
      - rtw89: add thermal protection
      - rtw89: fine tune BT-coexsitence to improve user experience
      - rtw89: firmware secure boot for WiFi 6 chip
 
  - Bluetooth
      - add Qualcomm WCN785x support for ids Foxconn 0xe0fc/0xe0f3 and
        0x13d3:0x3623
      - add Realtek RTL8852BE support for id Foxconn 0xe123
      - add MediaTek MT7920 support for wireless module ids
      - btintel_pcie: add handshake between driver and firmware
      - btintel_pcie: add recovery mechanism
      - btnxpuart: add GPIO support to power save feature
 
 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Merge tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Paolo Abeni:
 "The most significant set of changes is the per netns RTNL. The new
  behavior is disabled by default, regression risk should be contained.

  Notably the new config knob PTP_1588_CLOCK_VMCLOCK will inherit its
  default value from PTP_1588_CLOCK_KVM, as the first is intended to be
  a more reliable replacement for the latter.

  Core:

   - Started a very large, in-progress, effort to make the RTNL lock
     scope per network-namespace, thus reducing the lock contention
     significantly in the containerized use-case, comprising:
       - RCU-ified some relevant slices of the FIB control path
       - introduce basic per netns locking helpers
       - namespacified the IPv4 address hash table
       - remove rtnl_register{,_module}() in favour of
         rtnl_register_many()
       - refactor rtnl_{new,del,set}link() moving as much validation as
         possible out of RTNL lock
       - convert all phonet doit() and dumpit() handlers to RCU
       - convert IPv4 addresses manipulation to per-netns RTNL
       - convert virtual interface creation to per-netns RTNL
     the per-netns lock infrastructure is guarded by the
     CONFIG_DEBUG_NET_SMALL_RTNL knob, disabled by default ad interim.

   - Introduce NAPI suspension, to efficiently switching between busy
     polling (NAPI processing suspended) and normal processing.

   - Migrate the IPv4 routing input, output and control path from direct
     ToS usage to DSCP macros. This is a work in progress to make ECN
     handling consistent and reliable.

   - Add drop reasons support to the IPv4 rotue input path, allowing
     better introspection in case of packets drop.

   - Make FIB seqnum lockless, dropping RTNL protection for read access.

   - Make inet{,v6} addresses hashing less predicable.

   - Allow providing timestamp OPT_ID via cmsg, to correlate TX packets
     and timestamps

  Things we sprinkled into general kernel code:

   - Add small file operations for debugfs, to reduce the struct ops
     size.

   - Refactoring and optimization for the implementation of page_frag
     API, This is a preparatory work to consolidate the page_frag
     implementation.

  Netfilter:

   - Optimize set element transactions to reduce memory consumption

   - Extended netlink error reporting for attribute parser failure.

   - Make legacy xtables configs user selectable, giving users the
     option to configure iptables without enabling any other config.

   - Address a lot of false-positive RCU issues, pointed by recent CI
     improvements.

  BPF:

   - Put xsk sockets on a struct diet and add various cleanups. Overall,
     this helps to bump performance by 12% for some workloads.

   - Extend BPF selftests to increase coverage of XDP features in
     combination with BPF cpumap.

   - Optimize and homogenize bpf_csum_diff helper for all archs and also
     add a batch of new BPF selftests for it.

   - Extend netkit with an option to delegate skb->{mark,priority}
     scrubbing to its BPF program.

   - Make the bpf_get_netns_cookie() helper available also to tc(x) BPF
     programs.

  Protocols:

   - Introduces 4-tuple hash for connected udp sockets, speeding-up
     significantly connected sockets lookup.

   - Add a fastpath for some TCP timers that usually expires after
     close, the socket lock contention.

   - Add inbound and outbound xfrm state caches to speed up state
     lookups.

   - Avoid sending MPTCP advertisements on stale subflows, reducing
     risks on loosing them.

   - Make neighbours table flushing more scalable, maintaining per
     device neigh lists.

  Driver API:

   - Introduce a unified interface to configure transmission H/W
     shaping, and expose it to user-space via generic-netlink.

   - Add support for per-NAPI config via netlink. This makes napi
     configuration persistent across queues removal and re-creation.
     Requires driver updates, currently supported drivers are:
     nVidia/Mellanox mlx4 and mlx5, Broadcom brcm and Intel ice.

   - Add ethtool support for writing SFP / PHY firmware blocks.

   - Track RSS context allocation from ethtool core.

   - Implement support for mirroring to DSA CPU port, via TC mirror
     offload.

   - Consolidate FDB updates notification, to avoid duplicates on
     device-specific entries.

   - Expose DPLL clock quality level to the user-space.

   - Support master-slave PHY config via device tree.

  Tests and tooling:

   - forwarding: introduce deferred commands, to simplify the cleanup
     phase

  Drivers:

   - Updated several drivers - Amazon vNic, Google vNic, Microsoft vNic,
     Intel e1000e and Broadcom Tigon3 - to use netdev-genl to link the
     IRQs and queues to NAPI IDs, allowing busy polling and better
     introspection.

   - Ethernet high-speed NICs:
      - nVidia/Mellanox:
         - mlx5:
           - a large refactor to implement support for cross E-Switch
             scheduling
           - refactor H/W conter management to let it scale better
           - H/W GRO cleanups
      - Intel (100G, ice)::
         - add support for ethtool reset
         - implement support for per TX queue H/W shaping
      - AMD/Solarflare:
         - implement per device queue stats support
      - Broadcom (bnxt):
         - improve wildcard l4proto on IPv4/IPv6 ntuple rules
      - Marvell Octeon:
         - Add representor support for each Resource Virtualization Unit
           (RVU) device.
      - Hisilicon:
         - add support for the BMC Gigabit Ethernet
      - IBM (EMAC):
         - driver cleanup and modernization
      - Cisco (VIC):
         - raise the queues number limit to 256

   - Ethernet virtual:
      - Google vNIC:
         - implement page pool support
      - macsec:
         - inherit lower device's features and TSO limits when
           offloading
      - virtio_net:
         - enable premapped mode by default
         - support for XDP socket(AF_XDP) zerocopy TX
      - wireguard:
         - set the TSO max size to be GSO_MAX_SIZE, to aggregate larger
           packets.

   - Ethernet NICs embedded and virtual:
      - Broadcom ASP:
         - enable software timestamping
      - Freescale:
         - add enetc4 PF driver
      - MediaTek: Airoha SoC:
         - implement BQL support
      - RealTek r8169:
         - enable TSO by default on r8168/r8125
         - implement extended ethtool stats
      - Renesas AVB:
         - enable TX checksum offload
      - Synopsys (stmmac):
         - support header splitting for vlan tagged packets
         - move common code for DWMAC4 and DWXGMAC into a separate FPE
           module.
         - add dwmac driver support for T-HEAD TH1520 SoC
      - Synopsys (xpcs):
         - driver refactor and cleanup
      - TI:
         - icssg_prueth: add VLAN offload support
      - Xilinx emaclite:
         - add clock support

   - Ethernet switches:
      - Microchip:
         - implement support for the lan969x Ethernet switch family
         - add LAN9646 switch support to KSZ DSA driver

   - Ethernet PHYs:
      - Marvel: 88q2x: enable auto negotiation
      - Microchip: add support for LAN865X Rev B1 and LAN867X Rev C1/C2

   - PTP:
      - Add support for the Amazon virtual clock device
      - Add PtP driver for s390 clocks

   - WiFi:
      - mac80211
         - EHT 1024 aggregation size for transmissions
         - new operation to indicate that a new interface is to be added
         - support radio separation of multi-band devices
         - move wireless extension spy implementation to libiw
      - Broadcom:
         - brcmfmac: optional LPO clock support
      - Microchip:
         - add support for Atmel WILC3000
      - Qualcomm (ath12k):
         - firmware coredump collection support
         - add debugfs support for a multitude of statistics
      - Qualcomm (ath5k):
         -  Arcadyan ARV45XX AR2417 & Gigaset SX76[23] AR241[34]A support
      - Realtek:
         - rtw88: 8821au and 8812au USB adapters support
         - rtw89: add thermal protection
         - rtw89: fine tune BT-coexsitence to improve user experience
         - rtw89: firmware secure boot for WiFi 6 chip

   - Bluetooth
      - add Qualcomm WCN785x support for ids Foxconn 0xe0fc/0xe0f3 and
        0x13d3:0x3623
      - add Realtek RTL8852BE support for id Foxconn 0xe123
      - add MediaTek MT7920 support for wireless module ids
      - btintel_pcie: add handshake between driver and firmware
      - btintel_pcie: add recovery mechanism
      - btnxpuart: add GPIO support to power save feature"

* tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1475 commits)
  mm: page_frag: fix a compile error when kernel is not compiled
  Documentation: tipc: fix formatting issue in tipc.rst
  selftests: nic_performance: Add selftest for performance of NIC driver
  selftests: nic_link_layer: Add selftest case for speed and duplex states
  selftests: nic_link_layer: Add link layer selftest for NIC driver
  bnxt_en: Add FW trace coredump segments to the coredump
  bnxt_en: Add a new ethtool -W dump flag
  bnxt_en: Add 2 parameters to bnxt_fill_coredump_seg_hdr()
  bnxt_en: Add functions to copy host context memory
  bnxt_en: Do not free FW log context memory
  bnxt_en: Manage the FW trace context memory
  bnxt_en: Allocate backing store memory for FW trace logs
  bnxt_en: Add a 'force' parameter to bnxt_free_ctx_mem()
  bnxt_en: Refactor bnxt_free_ctx_mem()
  bnxt_en: Add mem_valid bit to struct bnxt_ctx_mem_type
  bnxt_en: Update firmware interface spec to 1.10.3.85
  selftests/bpf: Add some tests with sockmap SK_PASS
  bpf: fix recursive lock when verdict program return SK_PASS
  wireguard: device: support big tcp GSO
  wireguard: selftests: load nf_conntrack if not present
  ...
 2024-11-21 08:28:08 -08:00
Linus Torvalds
d6b6d39054 workqueue: Changes for v6.13 
- Maximum concurrency limit of 512 which was set a long time ago is too low
   now. A legitimate use (BPF cgroup release) of system_wq could saturate it
   under stress test conditions leading to false dependencies and deadlocks.
   While the offending use was switched to a dedicated workqueue, use the
   opportunity to bump WQ_MAX_ACTIVE four fold and document that system
   workqueue shouldn't be saturated. Workqueue should add at least a warning
   mechanism for cases where system workqueues are saturated.
 
 - Recent workqueue updates to support more flexible execution topology made
   unbound workqueues use per-cpu worker pool frontends which pushed up
   workqueue flush overhead. As consecutive CPUs are likely to be pointing to
   the same worker pool, reduce overhead by switching locks only when
   necessary.
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Merge tag 'wq-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue updates from Tejun Heo:

 - The maximum concurrency limit of 512 which was set a long time ago is
   too low now.

   A legitimate use (BPF cgroup release) of system_wq could saturate it
   under stress test conditions leading to false dependencies and
   deadlocks.

   While the offending use was switched to a dedicated workqueue, use
   the opportunity to bump WQ_MAX_ACTIVE four fold and document that
   system workqueue shouldn't be saturated. Workqueue should add at
   least a warning mechanism for cases where system workqueues are
   saturated.

 - Recent workqueue updates to support more flexible execution topology
   made unbound workqueues use per-cpu worker pool frontends which
   pushed up workqueue flush overhead.

   As consecutive CPUs are likely to be pointing to the same worker
   pool, reduce overhead by switching locks only when necessary.

* tag 'wq-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Reduce expensive locks for unbound workqueue
  workqueue: Adjust WQ_MAX_ACTIVE from 512 to 2048
  workqueue: doc: Add a note saturating the system_wq is not permitted
 2024-11-20 09:41:11 -08:00
Linus Torvalds
c3cda60e83 Another moderately busy cycle in docsland: 
- Work on Chinese translations has picked up again.  Happily, they are
   maintaining the existing translations and not just adding new ones.
 
 - Some maintenance of the Japanese and Italian translations as well.
 
 - The removal of the venerable "dontdiff" file.  It has long outlived its
   usefulness and contained entries ("parse.*") that would actively mask
   actual source change.
 
 - The addition of enforcement information to the code-of-conduct
   documentation.
 
 Along with some build-system fixes and a lot of typo and language fixes.
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Merge tag 'docs-6.13' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "Another moderately busy cycle in docsland:

   - Work on Chinese translations has picked up again. Happily, they are
     maintaining the existing translations and not just adding new ones.

   - Some maintenance of the Japanese and Italian translations as well.

   - The removal of the venerable "dontdiff" file. It has long outlived
     its usefulness and contained entries ("parse.*") that would
     actively mask actual source change.

   - The addition of enforcement information to the code-of-conduct
     documentation.

  Along with some build-system fixes and a lot of typo and language
  fixes"

* tag 'docs-6.13' of git://git.lwn.net/linux: (52 commits)
  Documentation/CoC: spell out enforcement for unacceptable behaviors
  docs: fix typos and whitespace in Documentation/process/backporting.rst
  docs/zh_CN: fix one sentence in llvm.rst
  docs: bug-bisect: add a note about bisecting -next
  docs/zh_CN: add the translation of kbuild/llvm.rst
  Documentation: Fix incorrect paths/magic in magic numbers rst
  Documentation/maintainer-tip: Fix typos
  Documentation: Improve crash_kexec_post_notifiers description
  Docs/zh_CN: Translate physical_memory.rst to Simplified Chinese
  Documentation: admin: reorganize kernel-parameters intro
  docs/zh_CN: update the translation of process/programming-language.rst
  docs/zh_CN: update the translation of mm/page_owner.rst
  docs/zh_CN: update the translation of mm/page_table_check.rst
  docs/zh_CN: update the translation of mm/overcommit-accounting.rst
  docs/zh_CN: update the translation of mm/admon/faq.rst
  docs/zh_CN: update the translation of mm/active_mm.rst
  docs/zh_CN: update the translation of mm/hmm.rst
  docs: remove Documentation/dontdiff
  docs/zh_CN: Add a entry in Chinese glossary
  Docs/zh_CN: Fix the pfn calculation error in page_tables.rst
  ...
 2024-11-20 09:16:45 -08:00
Kuan-Wei Chiu
ec7c2bda80 Documentation/core-api: add min heap API introduction 
Introduce an overview of the min heap API, detailing its usage and
functionality.  The documentation aims to provide developers with a clear
understanding of how to implement and utilize min heaps within the Linux
kernel, enhancing the overall accessibility of this data structure.

Link: https://lkml.kernel.org/r/20241020040200.939973-11-visitorckw@gmail.com
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw>
Cc: Coly Li <colyli@suse.de>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: "Liang, Kan" <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Sakai <msakai@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2024-11-05 17:12:37 -08:00