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Author SHA1 Message Date
Linus Torvalds
a1a671092d \n 
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Merge tag 'fs_for_v7.1-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull isofs and udf fixes from Jan Kara:
 "Several isofs and udf fixes"

* tag 'fs_for_v7.1-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  docs: isofs: replace dead ECMA-119 FTP link
  udf: reject descriptors with oversized CRC length
  isofs: use QSTR_LEN() in isofs_cmp
  isofs: validate block number from NFS file handle in isofs_export_iget
  isofs: validate Rock Ridge CE continuation extent against volume size
 2026-04-27 16:45:39 -07:00
Ziran Zhang
13917f71a9 docs: isofs: replace dead ECMA-119 FTP link 
The original link is no longer valid. Replace it with the official
PDF of the 2nd edition. The new link points to the exact 2nd edition
that the existing comment in isofs.rst refers to.

Signed-off-by: Ziran Zhang <zhangcoder@yeah.net>
Link: https://patch.msgid.link/20260425142943.6809-1-zhangcoder@yeah.net
Signed-off-by: Jan Kara <jack@suse.cz>
 2026-04-27 12:58:07 +02:00
Linus Torvalds
292a2bcd17 Fixing livelocks in shrink_dcache_tree() 
If shrink_dcache_tree() finds a dentry in the middle of being killed
 by another thread, it has to wait until the victim finishes dying,
 gets detached from the tree and ceases to pin its parent.
 
 The way we used to deal with that amounted to busy-wait; unfortunately,
 it's not just inefficient but can lead to reliably reproducible hard
 livelocks.
 
 Solved by having shrink_dentry_tree() attach a completion to such dentry,
 with dentry_unlist() calling complete() on all objects attached to it.
 With a bit of care it can be done without growing struct dentry or adding
 overhead in normal case.
 
 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-dcache-busy-wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull dcache busy loop updates from Al Viro:
 "Fix livelocks in shrink_dcache_tree()

  If shrink_dcache_tree() finds a dentry in the middle of being killed
  by another thread, it has to wait until the victim finishes dying,
  gets detached from the tree and ceases to pin its parent.

  The way we used to deal with that amounted to busy-wait;
  unfortunately, it's not just inefficient but can lead to reliably
  reproducible hard livelocks.

  Solved by having shrink_dentry_tree() attach a completion to such
  dentry, with dentry_unlist() calling complete() on all objects
  attached to it. With a bit of care it can be done without growing
  struct dentry or adding overhead in normal case"

* tag 'pull-dcache-busy-wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  get rid of busy-waiting in shrink_dcache_tree()
  dcache.c: more idiomatic "positives are not allowed" sanity checks
  struct dentry: make ->d_u anonymous
  for_each_alias(): helper macro for iterating through dentries of given inode
 2026-04-21 07:30:44 -07:00
Linus Torvalds
36d179fd6b NFSD 7.1 Release Notes 
Benjamin Coddington contributed filehandle signing to defend against
 filehandle-guessing attacks. The server now appends a SipHash-2-4
 MAC to each filehandle when the new "sign_fh" export option is
 enabled. NFSD then verifies filehandles received from clients
 against the expected MAC; mismatches return NFS error STALE.
 
 Chuck Lever converted the entire NLMv4 server-side XDR layer from
 hand-written C to xdrgen-generated code, spanning roughly thirty
 patches. XDR functions are generally boilerplate code and are easy
 to get wrong. The goals of this conversion are improved memory
 safety, lower maintenance burden, and groundwork for eventual Rust
 code generation for these functions.
 
 Dai Ngo improved pNFS block/SCSI layout robustness with two related
 changes. SCSI persistent reservation fencing is now tracked per
 client and per device via an xarray, to avoid both redundant preempt
 operations on devices already fenced and a potential NFSD deadlock
 when all nfsd threads are waiting for a layout return.
 
 The remaining patches deliver scalability and infrastructure
 improvements. Sincere thanks to all contributors, reviewers,
 testers, and bug reporters who participated in the v7.1 NFSD
 development cycle.
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Merge tag 'nfsd-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd updates from Chuck Lever:

 - filehandle signing to defend against filehandle-guessing attacks
   (Benjamin Coddington)

   The server now appends a SipHash-2-4 MAC to each filehandle when
   the new "sign_fh" export option is enabled. NFSD then verifies
   filehandles received from clients against the expected MAC;
   mismatches return NFS error STALE

 - convert the entire NLMv4 server-side XDR layer from hand-written C to
   xdrgen-generated code, spanning roughly thirty patches (Chuck Lever)

   XDR functions are generally boilerplate code and are easy to get
   wrong. The goals of this conversion are improved memory safety, lower
   maintenance burden, and groundwork for eventual Rust code generation
   for these functions.

 - improve pNFS block/SCSI layout robustness with two related changes
   (Dai Ngo)

   SCSI persistent reservation fencing is now tracked per client and
   per device via an xarray, to avoid both redundant preempt operations
   on devices already fenced and a potential NFSD deadlock when all nfsd
   threads are waiting for a layout return.

 - scalability and infrastructure improvements

   Sincere thanks to all contributors, reviewers, testers, and bug
   reporters who participated in the v7.1 NFSD development cycle.

* tag 'nfsd-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: (83 commits)
  NFSD: Docs: clean up pnfs server timeout docs
  nfsd: fix comment typo in nfsxdr
  nfsd: fix comment typo in nfs3xdr
  NFSD: convert callback RPC program to per-net namespace
  NFSD: use per-operation statidx for callback procedures
  svcrdma: Use contiguous pages for RDMA Read sink buffers
  SUNRPC: Add svc_rqst_page_release() helper
  SUNRPC: xdr.h: fix all kernel-doc warnings
  svcrdma: Factor out WR chain linking into helper
  svcrdma: Add Write chunk WRs to the RPC's Send WR chain
  svcrdma: Clean up use of rdma->sc_pd->device
  svcrdma: Clean up use of rdma->sc_pd->device in Receive paths
  svcrdma: Add fair queuing for Send Queue access
  SUNRPC: Optimize rq_respages allocation in svc_alloc_arg
  SUNRPC: Track consumed rq_pages entries
  svcrdma: preserve rq_next_page in svc_rdma_save_io_pages
  SUNRPC: Handle NULL entries in svc_rqst_release_pages
  SUNRPC: Allocate a separate Reply page array
  SUNRPC: Tighten bounds checking in svc_rqst_replace_page
  NFSD: Sign filehandles
  ...
 2026-04-20 10:44:02 -07:00
Linus Torvalds
40735a683b mm.git review status for linus..mm-stable 
Everything:
 
 Total patches:       121
 Reviews/patch:       2.11
 Reviewed rate:       90%
 
 Excluding DAMON:
 
 Total patches:       113
 Reviews/patch:       2.25
 Reviewed rate:       96%
 
 - The 33 patch series "Eliminate Dying Memory Cgroup" from Qi Zheng and
   Muchun Song addresses the longstanding "dying memcg problem".  A
   situation wherein a no-longer-used memory control group will hang around
   for an extended period pointlessly consuming memory.  The [0/N]
   changelog has a good overview of this work.
 
 - The 3 patch series "fix unexpected type conversions and potential
   overflows" from Qi Zheng fixes a couple of potential 32-bit/64-bit
   issues which were identified during review of the "Eliminate Dying
   Memory Cgroup" series.
 
 - The 6 patch series "kho: history: track previous kernel version and
   kexec boot count" from Breno Leitao uses Kexec Handover (KHO) to pass
   the previous kernel's version string and the number of kexec reboots
   since the last cold boot to the next kernel, and prints it at boot time.
 
 - The 4 patch series "liveupdate: prevent double preservation" from
   Pasha Tatashin teaches LUO to avoid managing the same file across
   different active sessions.
 
 - The 10 patch series "liveupdate: Fix module unloading and unregister
   API" from Pasha Tatashin addresses an issue with how LUO handles module
   reference counting and unregistration during module unloading.
 
 - The 2 patch series "zswap pool per-CPU acomp_ctx simplifications" from
   Kanchana Sridhar simplifies and cleans up the zswap crypto compression
   handling and improves the lifecycle management of zswap pool's per-CPU
   acomp_ctx resources.
 
 - The 2 patch series "mm/damon/core: fix damon_call()/damos_walk() vs
   kdmond exit race" from SeongJae Park addresses unlikely but possible
   leaks and deadlocks in damon_call() and damon_walk().
 
 - The 2 patch series "mm/damon/core: validate damos_quota_goal->nid"
   from SeongJae Park fixes a couple of root-only wild pointer
   dereferences.
 
 - The 2 patch series "Docs/admin-guide/mm/damon: warn commit_inputs vs
   other params race" from SeongJae Park updates the DAMON documentation to
   warn operators about potential races which can occur if the
   commit_inputs parameter is altered at the wrong time.
 
 - The 3 patch series "Minor hmm_test fixes and cleanups" from Alistair
   Popple implements two bugfixes a cleanup for the HMM kernel selftests.
 
 - The 6 patch series "Modify memfd_luo code" from Chenghao Duan provides
   cleanups, simplifications and speedups in the memfd_lou code.
 
 - The 4 patch series "mm, kvm: allow uffd support in guest_memfd" from
   Mike Rapoport enables support for userfaultfd in guest_memfd.
 
 - The 6 patch series "selftests/mm: skip several tests when thp is not
   available" from Chunyu Hu fixes several issues in the selftests code
   which were causing breakage when the tests were run on CONFIG_THP=n
   kernels.
 
 - The 2 patch series "mm/mprotect: micro-optimization work" from Pedro
   Falcato implements a couple of nice speedups for mprotect().
 
 - The 3 patch series "MAINTAINERS: update KHO and LIVE UPDATE entries"
   from Pratyush Yadav reflects upcoming changes in the maintenance of KHO,
   LUO, memfd_luo, kexec, crash, kdump and probably other kexec-based
   things - they are being moved out of mm.git and into a new git tree.
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Merge tag 'mm-stable-2026-04-18-02-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull more MM updates from Andrew Morton:

 - "Eliminate Dying Memory Cgroup" (Qi Zheng and Muchun Song)

   Address the longstanding "dying memcg problem". A situation wherein a
   no-longer-used memory control group will hang around for an extended
   period pointlessly consuming memory

 - "fix unexpected type conversions and potential overflows" (Qi Zheng)

   Fix a couple of potential 32-bit/64-bit issues which were identified
   during review of the "Eliminate Dying Memory Cgroup" series

 - "kho: history: track previous kernel version and kexec boot count"
   (Breno Leitao)

   Use Kexec Handover (KHO) to pass the previous kernel's version string
   and the number of kexec reboots since the last cold boot to the next
   kernel, and print it at boot time

 - "liveupdate: prevent double preservation" (Pasha Tatashin)

   Teach LUO to avoid managing the same file across different active
   sessions

 - "liveupdate: Fix module unloading and unregister API" (Pasha
   Tatashin)

   Address an issue with how LUO handles module reference counting and
   unregistration during module unloading

 - "zswap pool per-CPU acomp_ctx simplifications" (Kanchana Sridhar)

   Simplify and clean up the zswap crypto compression handling and
   improve the lifecycle management of zswap pool's per-CPU acomp_ctx
   resources

 - "mm/damon/core: fix damon_call()/damos_walk() vs kdmond exit race"
   (SeongJae Park)

   Address unlikely but possible leaks and deadlocks in damon_call() and
   damon_walk()

 - "mm/damon/core: validate damos_quota_goal->nid" (SeongJae Park)

   Fix a couple of root-only wild pointer dereferences

 - "Docs/admin-guide/mm/damon: warn commit_inputs vs other params race"
   (SeongJae Park)

   Update the DAMON documentation to warn operators about potential
   races which can occur if the commit_inputs parameter is altered at
   the wrong time

 - "Minor hmm_test fixes and cleanups" (Alistair Popple)

   Bugfixes and a cleanup for the HMM kernel selftests

 - "Modify memfd_luo code" (Chenghao Duan)

   Cleanups, simplifications and speedups to the memfd_lou code

 - "mm, kvm: allow uffd support in guest_memfd" (Mike Rapoport)

   Support for userfaultfd in guest_memfd

 - "selftests/mm: skip several tests when thp is not available" (Chunyu
   Hu)

   Fix several issues in the selftests code which were causing breakage
   when the tests were run on CONFIG_THP=n kernels

 - "mm/mprotect: micro-optimization work" (Pedro Falcato)

   A couple of nice speedups for mprotect()

 - "MAINTAINERS: update KHO and LIVE UPDATE entries" (Pratyush Yadav)

   Document upcoming changes in the maintenance of KHO, LUO, memfd_luo,
   kexec, crash, kdump and probably other kexec-based things - they are
   being moved out of mm.git and into a new git tree

* tag 'mm-stable-2026-04-18-02-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (121 commits)
  MAINTAINERS: add page cache reviewer
  mm/vmscan: avoid false-positive -Wuninitialized warning
  MAINTAINERS: update Dave's kdump reviewer email address
  MAINTAINERS: drop include/linux/liveupdate from LIVE UPDATE
  MAINTAINERS: drop include/linux/kho/abi/ from KHO
  MAINTAINERS: update KHO and LIVE UPDATE maintainers
  MAINTAINERS: update kexec/kdump maintainers entries
  mm/migrate_device: remove dead migration entry check in migrate_vma_collect_huge_pmd()
  selftests: mm: skip charge_reserved_hugetlb without killall
  userfaultfd: allow registration of ranges below mmap_min_addr
  mm/vmstat: fix vmstat_shepherd double-scheduling vmstat_update
  mm/hugetlb: fix early boot crash on parameters without '=' separator
  zram: reject unrecognized type= values in recompress_store()
  docs: proc: document ProtectionKey in smaps
  mm/mprotect: special-case small folios when applying permissions
  mm/mprotect: move softleaf code out of the main function
  mm: remove '!root_reclaim' checking in should_abort_scan()
  mm/sparse: fix comment for section map alignment
  mm/page_io: use sio->len for PSWPIN accounting in sio_read_complete()
  selftests/mm: transhuge_stress: skip the test when thp not available
  ...
 2026-04-19 08:01:17 -07:00
Kevin Brodsky
9a8ea3c1cb docs: proc: document ProtectionKey in smaps 
The ProtectionKey entry was added in v4.9; back then it was x86-specific,
but it now lives in generic code and applies to all architectures
supporting pkeys (currently x86, power, arm64).

Time to document it: add a paragraph to proc.rst about the ProtectionKey
entry.

[akpm@linux-foundation.org: s/system/hardware/, per review discussion]
[akpm@linux-foundation.org: s/hardware/CPU/]
Link: https://lore.kernel.org/20260407125133.564182-1-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reported-by: Yury Khrustalev <yury.khrustalev@arm.com>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2026-04-18 00:10:55 -07:00
Linus Torvalds
cdd4dc3aeb Major changes: 
- Write support:
   Implemented full write support based on the classic read-only NTFS
   driver. Added delayed allocation to improve write performance through
   multi-cluster allocation and reduced fragmentation of the cluster
   bitmap.
 
 - iomap conversion:
   Switched buffered IO (reads/writes), direct IO, file extent mapping,
   readpages, and writepages to use iomap.
 
 - Remove buffer_head:
   Completely removed buffer_head usage by converting to folios.
   As a result, the dependency on CONFIG_BUFFER_HEAD has been removed
   from Kconfig.
 
 - Stability improvements:
   The new ntfs driver passes 326 xfstests, compared to 273 for ntfs3.
   All tests passed by ntfs3 are a complete subset of the tests passed
   by this implementation. Added support for fallocate, idmapped mounts,
   permissions, and more.
 
 - xfstests Results report:
   Total tests run: 787
   Passed         : 326
   Failed         : 38
   Skipped        : 423
 
 Failed tests breakdown:
   - 34 tests require metadata journaling
   - 4 other tests:
       094: No unwritten extent concept in NTFS on-disk format
       563: cgroup v2 aware writeback accounting not supported
       631: RENAME_WHITEOUT support required
       787: NFS delegation test
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Merge tag 'ntfs-for-7.1-rc1-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/ntfs

Pull ntfs resurrection from Namjae Jeon:
 "Ever since Kari Argillander’s 2022 report [1] regarding the state of
  the ntfs3 driver, I have spent the last 4 years working to provide
  full write support and current trends (iomap, no buffer head, folio),
  enhanced performance, stable maintenance, utility support including
  fsck for NTFS in Linux.

  This new implementation is built upon the clean foundation of the
  original read-only NTFS driver, adding:

   - Write support:

     Implemented full write support based on the classic read-only NTFS
     driver. Added delayed allocation to improve write performance
     through multi-cluster allocation and reduced fragmentation of the
     cluster bitmap.

   - iomap conversion:

     Switched buffered IO (reads/writes), direct IO, file extent
     mapping, readpages, and writepages to use iomap.

   - Remove buffer_head:

     Completely removed buffer_head usage by converting to folios. As a
     result, the dependency on CONFIG_BUFFER_HEAD has been removed from
     Kconfig.

   - Stability improvements:

     The new ntfs driver passes 326 xfstests, compared to 273 for ntfs3.
     All tests passed by ntfs3 are a complete subset of the tests passed
     by this implementation. Added support for fallocate, idmapped
     mounts, permissions, and more.

  xfstests Results report:

     Total tests run: 787
     Passed         : 326
     Failed         : 38
     Skipped        : 423

  Failed tests breakdown:
    - 34 tests require metadata journaling
    - 4 other tests:
         094: No unwritten extent concept in NTFS on-disk format
         563: cgroup v2 aware writeback accounting not supported
         631: RENAME_WHITEOUT support required
         787: NFS delegation test"

Link: https://lore.kernel.org/all/da20d32b-5185-f40b-48b8-2986922d8b25@stargateuniverse.net/ [1]

[ Let's see if this undead filesystem ends up being of the "Easter
  miracle" kind, or the "Nosferatu of filesystems" kind... ]

* tag 'ntfs-for-7.1-rc1-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/ntfs: (46 commits)
  ntfs: remove redundant out-of-bound checks
  ntfs: add bound checking to ntfs_external_attr_find
  ntfs: add bound checking to ntfs_attr_find
  ntfs: fix ignoring unreachable code warnings
  ntfs: fix inconsistent indenting warnings
  ntfs: fix variable dereferenced before check warnings
  ntfs: prefer IS_ERR_OR_NULL() over manual NULL check
  ntfs: harden ntfs_listxattr against EA entries
  ntfs: harden ntfs_ea_lookup against malformed EA entries
  ntfs: check $EA query-length in ntfs_ea_get
  ntfs: validate WSL EA payload sizes
  ntfs: fix WSL ea restore condition
  ntfs: add missing newlines to pr_err() messages
  ntfs: fix pointer/integer casting warnings
  ntfs: use ->mft_no instead of ->i_ino in prints
  ntfs: change mft_no type to u64
  ntfs: select FS_IOMAP in Kconfig
  ntfs: add MODULE_ALIAS_FS
  ntfs: reduce stack usage in ntfs_write_mft_block()
  ntfs: fix sysctl table registration and path
  ...
 2026-04-17 16:35:49 -07:00
Linus Torvalds
334fbe734e mm.git review status for linus..mm-stable 
Everything:
 
 Total patches:       368
 Reviews/patch:       1.56
 Reviewed rate:       74%
 
 Excluding DAMON:
 
 Total patches:       316
 Reviews/patch:       1.77
 Reviewed rate:       81%
 
 Excluding DAMON and zram:
 
 Total patches:       306
 Reviews/patch:       1.81
 Reviewed rate:       82%
 
 Excluding DAMON, zram and maple_tree:
 
 Total patches:       276
 Reviews/patch:       2.01
 Reviewed rate:       91%
 
 Significant patch series in this merge:
 
 - The 30 patch series "maple_tree: Replace big node with maple copy"
   from Liam Howlett is mainly prepararatory work for ongoing development
   but it does reduce stack usage and is an improvement.
 
 - The 12 patch series "mm, swap: swap table phase III: remove swap_map"
   from Kairui Song offers memory savings by removing the static swap_map.
   It also yields some CPU savings and implements several cleanups.
 
 - The 2 patch series "mm: memfd_luo: preserve file seals" from Pratyush
   Yadav adds file seal preservation to LUO's memfd code.
 
 - The 2 patch series "mm: zswap: add per-memcg stat for incompressible
   pages" from Jiayuan Chen adds additional userspace stats reportng to
   zswap.
 
 - The 4 patch series "arch, mm: consolidate empty_zero_page" from Mike
   Rapoport implements some cleanups for our handling of ZERO_PAGE() and
   zero_pfn.
 
 - The 2 patch series "mm/kmemleak: Improve scan_should_stop()
   implementation" from Zhongqiu Han provides an robustness improvement and
   some cleanups in the kmemleak code.
 
 - The 4 patch series "Improve khugepaged scan logic" from Vernon Yang
   "improves the khugepaged scan logic and reduces CPU consumption by
   prioritizing scanning tasks that access memory frequently".
 
 - The 2 patch series "Make KHO Stateless" from Jason Miu simplifies
   Kexec Handover by "transitioning KHO from an xarray-based metadata
   tracking system with serialization to a radix tree data structure that
   can be passed directly to the next kernel"
 
 - The 3 patch series "mm: vmscan: add PID and cgroup ID to vmscan
   tracepoints" from Thomas Ballasi and Steven Rostedt enhances vmscan's
   tracepointing.
 
 - The 5 patch series "mm: arch/shstk: Common shadow stack mapping helper
   and VM_NOHUGEPAGE" from Catalin Marinas is a cleanup for the shadow
   stack code: remove per-arch code in favour of a generic implementation.
 
 - The 2 patch series "Fix KASAN support for KHO restored vmalloc
   regions" from Pasha Tatashin fixes a WARN() which can be emitted the KHO
   restores a vmalloc area.
 
 - The 4 patch series "mm: Remove stray references to pagevec" from Tal
   Zussman provides several cleanups, mainly udpating references to "struct
   pagevec", which became folio_batch three years ago.
 
 - The 17 patch series "mm: Eliminate fake head pages from vmemmap
   optimization" from Kiryl Shutsemau simplifies the HugeTLB vmemmap
   optimization (HVO) by changing how tail pages encode their relationship
   to the head page.
 
 - The 2 patch series "mm/damon/core: improve DAMOS quota efficiency for
   core layer filters" from SeongJae Park improves two problematic
   behaviors of DAMOS that makes it less efficient when core layer filters
   are used.
 
 - The 3 patch series "mm/damon: strictly respect min_nr_regions" from
   SeongJae Park improves DAMON usability by extending the treatment of the
   min_nr_regions user-settable parameter.
 
 - The 3 patch series "mm/page_alloc: pcp locking cleanup" from Vlastimil
   Babka is a proper fix for a previously hotfixed SMP=n issue.  Code
   simplifications and cleanups ennsed.
 
 - The 16 patch series "mm: cleanups around unmapping / zapping" from
   David Hildenbrand implements "a bunch of cleanups around unmapping and
   zapping.  Mostly simplifications, code movements, documentation and
   renaming of zapping functions".
 
 - The 6 patch series "support batched checking of the young flag for
   MGLRU" from Baolin Wang supports batched checking of the young flag for
   MGLRU.  It's part cleanups; one benchmark shows large performance
   benefits for arm64.
 
 - The 5 patch series "memcg: obj stock and slab stat caching cleanups"
   from Johannes Weiner provides memcg cleanup and robustness improvements.
 
 - The 5 patch series "Allow order zero pages in page reporting" from
   Yuvraj Sakshith enhances page_reporting's free page reporting - it is
   presently and undesirably order-0 pages when reporting free memory.
 
 - The 6 patch series "mm: vma flag tweaks" from Lorenzo Stoakes is
   cleanup work following from the recent conversion of the VMA flags to a
   bitmap.
 
 - The 10 patch series "mm/damon: add optional debugging-purpose sanity
   checks" from SeongJae Park adds some more developer-facing debug checks
   into DAMON core.
 
 - The 2 patch series "mm/damon: test and document power-of-2
   min_region_sz requirement" from SeongJae Park adds an additional DAMON
   kunit test and makes some adjustments to the addr_unit parameter
   handling.
 
 - The 3 patch series "mm/damon/core: make passed_sample_intervals
   comparisons overflow-safe" from SeongJae Park fixes a hard-to-hit time
   overflow issue in DAMON core.
 
 - The 7 patch series "mm/damon: improve/fixup/update ratio calculation,
   test and documentation" from SeongJae Park is a "batch of misc/minor
   improvements and fixups" for DAMON.
 
 - The 4 patch series "mm: move vma_(kernel|mmu)_pagesize() out of
   hugetlb.c" from David Hildenbrand fixes a possible issue with dax-device
   when CONFIG_HUGETLB=n.  Some code movement was required.
 
 - The 6 patch series "zram: recompression cleanups and tweaks" from
   Sergey Senozhatsky provides "a somewhat random mix of fixups,
   recompression cleanups and improvements" in the zram code.
 
 - The 11 patch series "mm/damon: support multiple goal-based quota
   tuning algorithms" from SeongJae Park extend DAMOS quotas goal
   auto-tuning to support multiple tuning algorithms that users can select.
 
 - The 4 patch series "mm: thp: reduce unnecessary
   start_stop_khugepaged()" from Breno Leitao fixes the khugpaged sysfs
   handling so we no longer spam the logs with reams of junk when
   starting/stopping khugepaged.
 
 - The 3 patch series "mm: improve map count checks" from Lorenzo Stoakes
   provides some cleanups and slight fixes in the mremap, mmap and vma
   code.
 
 - The 5 patch series "mm/damon: support addr_unit on default monitoring
   targets for modules" from SeongJae Park extends the use of DAMON core's
   addr_unit tunable.
 
 - The 5 patch series "mm: khugepaged cleanups and mTHP prerequisites"
   from Nico Pache provides cleanups in the khugepaged and is a base for
   Nico's planned khugepaged mTHP support.
 
 - The 15 patch series "mm: memory hot(un)plug and SPARSEMEM cleanups"
   from David Hildenbrand implements code movement and cleanups in the
   memhotplug and sparsemem code.
 
 - The 2 patch series "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and
   cleanup CONFIG_MIGRATION" from David Hildenbrand rationalizes some
   memhotplug Kconfig support.
 
 - The 6 patch series "change young flag check functions to return bool"
   from Baolin Wang is "a cleanup patchset to change all young flag check
   functions to return bool".
 
 - The 3 patch series "mm/damon/sysfs: fix memory leak and NULL
   dereference issues" from Josh Law and SeongJae Park fixes a few
   potential DAMON bugs.
 
 - The 25 patch series "mm/vma: convert vm_flags_t to vma_flags_t in vma
   code" from "converts a lot of the existing use of the legacy vm_flags_t
   data type to the new vma_flags_t type which replaces it".  Mainly in the
   vma code.
 
 - The 21 patch series "mm: expand mmap_prepare functionality and usage"
   from Lorenzo Stoakes "expands the mmap_prepare functionality, which is
   intended to replace the deprecated f_op->mmap hook which has been the
   source of bugs and security issues for some time".  Cleanups,
   documentation, extension of mmap_prepare into filesystem drivers.
 
 - The 13 patch series "mm/huge_memory: refactor zap_huge_pmd()" from
   Lorenzo Stoakes simplifies and cleans up zap_huge_pmd().  Additional
   cleanups around vm_normal_folio_pmd() and the softleaf functionality are
   performed.
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Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - "maple_tree: Replace big node with maple copy" (Liam Howlett)

   Mainly prepararatory work for ongoing development but it does reduce
   stack usage and is an improvement.

 - "mm, swap: swap table phase III: remove swap_map" (Kairui Song)

   Offers memory savings by removing the static swap_map. It also yields
   some CPU savings and implements several cleanups.

 - "mm: memfd_luo: preserve file seals" (Pratyush Yadav)

   File seal preservation to LUO's memfd code

 - "mm: zswap: add per-memcg stat for incompressible pages" (Jiayuan
   Chen)

   Additional userspace stats reportng to zswap

 - "arch, mm: consolidate empty_zero_page" (Mike Rapoport)

   Some cleanups for our handling of ZERO_PAGE() and zero_pfn

 - "mm/kmemleak: Improve scan_should_stop() implementation" (Zhongqiu
   Han)

   A robustness improvement and some cleanups in the kmemleak code

 - "Improve khugepaged scan logic" (Vernon Yang)

   Improve khugepaged scan logic and reduce CPU consumption by
   prioritizing scanning tasks that access memory frequently

 - "Make KHO Stateless" (Jason Miu)

   Simplify Kexec Handover by transitioning KHO from an xarray-based
   metadata tracking system with serialization to a radix tree data
   structure that can be passed directly to the next kernel

 - "mm: vmscan: add PID and cgroup ID to vmscan tracepoints" (Thomas
   Ballasi and Steven Rostedt)

   Enhance vmscan's tracepointing

 - "mm: arch/shstk: Common shadow stack mapping helper and
   VM_NOHUGEPAGE" (Catalin Marinas)

   Cleanup for the shadow stack code: remove per-arch code in favour of
   a generic implementation

 - "Fix KASAN support for KHO restored vmalloc regions" (Pasha Tatashin)

   Fix a WARN() which can be emitted the KHO restores a vmalloc area

 - "mm: Remove stray references to pagevec" (Tal Zussman)

   Several cleanups, mainly udpating references to "struct pagevec",
   which became folio_batch three years ago

 - "mm: Eliminate fake head pages from vmemmap optimization" (Kiryl
   Shutsemau)

   Simplify the HugeTLB vmemmap optimization (HVO) by changing how tail
   pages encode their relationship to the head page

 - "mm/damon/core: improve DAMOS quota efficiency for core layer
   filters" (SeongJae Park)

   Improve two problematic behaviors of DAMOS that makes it less
   efficient when core layer filters are used

 - "mm/damon: strictly respect min_nr_regions" (SeongJae Park)

   Improve DAMON usability by extending the treatment of the
   min_nr_regions user-settable parameter

 - "mm/page_alloc: pcp locking cleanup" (Vlastimil Babka)

   The proper fix for a previously hotfixed SMP=n issue. Code
   simplifications and cleanups ensued

 - "mm: cleanups around unmapping / zapping" (David Hildenbrand)

   A bunch of cleanups around unmapping and zapping. Mostly
   simplifications, code movements, documentation and renaming of
   zapping functions

 - "support batched checking of the young flag for MGLRU" (Baolin Wang)

   Batched checking of the young flag for MGLRU. It's part cleanups; one
   benchmark shows large performance benefits for arm64

 - "memcg: obj stock and slab stat caching cleanups" (Johannes Weiner)

   memcg cleanup and robustness improvements

 - "Allow order zero pages in page reporting" (Yuvraj Sakshith)

   Enhance free page reporting - it is presently and undesirably order-0
   pages when reporting free memory.

 - "mm: vma flag tweaks" (Lorenzo Stoakes)

   Cleanup work following from the recent conversion of the VMA flags to
   a bitmap

 - "mm/damon: add optional debugging-purpose sanity checks" (SeongJae
   Park)

   Add some more developer-facing debug checks into DAMON core

 - "mm/damon: test and document power-of-2 min_region_sz requirement"
   (SeongJae Park)

   An additional DAMON kunit test and makes some adjustments to the
   addr_unit parameter handling

 - "mm/damon/core: make passed_sample_intervals comparisons
   overflow-safe" (SeongJae Park)

   Fix a hard-to-hit time overflow issue in DAMON core

 - "mm/damon: improve/fixup/update ratio calculation, test and
   documentation" (SeongJae Park)

   A batch of misc/minor improvements and fixups for DAMON

 - "mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c" (David
   Hildenbrand)

   Fix a possible issue with dax-device when CONFIG_HUGETLB=n. Some code
   movement was required.

 - "zram: recompression cleanups and tweaks" (Sergey Senozhatsky)

   A somewhat random mix of fixups, recompression cleanups and
   improvements in the zram code

 - "mm/damon: support multiple goal-based quota tuning algorithms"
   (SeongJae Park)

   Extend DAMOS quotas goal auto-tuning to support multiple tuning
   algorithms that users can select

 - "mm: thp: reduce unnecessary start_stop_khugepaged()" (Breno Leitao)

   Fix the khugpaged sysfs handling so we no longer spam the logs with
   reams of junk when starting/stopping khugepaged

 - "mm: improve map count checks" (Lorenzo Stoakes)

   Provide some cleanups and slight fixes in the mremap, mmap and vma
   code

 - "mm/damon: support addr_unit on default monitoring targets for
   modules" (SeongJae Park)

   Extend the use of DAMON core's addr_unit tunable

 - "mm: khugepaged cleanups and mTHP prerequisites" (Nico Pache)

   Cleanups to khugepaged and is a base for Nico's planned khugepaged
   mTHP support

 - "mm: memory hot(un)plug and SPARSEMEM cleanups" (David Hildenbrand)

   Code movement and cleanups in the memhotplug and sparsemem code

 - "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanup
   CONFIG_MIGRATION" (David Hildenbrand)

   Rationalize some memhotplug Kconfig support

 - "change young flag check functions to return bool" (Baolin Wang)

   Cleanups to change all young flag check functions to return bool

 - "mm/damon/sysfs: fix memory leak and NULL dereference issues" (Josh
   Law and SeongJae Park)

   Fix a few potential DAMON bugs

 - "mm/vma: convert vm_flags_t to vma_flags_t in vma code" (Lorenzo
   Stoakes)

   Convert a lot of the existing use of the legacy vm_flags_t data type
   to the new vma_flags_t type which replaces it. Mainly in the vma
   code.

 - "mm: expand mmap_prepare functionality and usage" (Lorenzo Stoakes)

   Expand the mmap_prepare functionality, which is intended to replace
   the deprecated f_op->mmap hook which has been the source of bugs and
   security issues for some time. Cleanups, documentation, extension of
   mmap_prepare into filesystem drivers

 - "mm/huge_memory: refactor zap_huge_pmd()" (Lorenzo Stoakes)

   Simplify and clean up zap_huge_pmd(). Additional cleanups around
   vm_normal_folio_pmd() and the softleaf functionality are performed.

* tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (369 commits)
  mm: fix deferred split queue races during migration
  mm/khugepaged: fix issue with tracking lock
  mm/huge_memory: add and use has_deposited_pgtable()
  mm/huge_memory: add and use normal_or_softleaf_folio_pmd()
  mm: add softleaf_is_valid_pmd_entry(), pmd_to_softleaf_folio()
  mm/huge_memory: separate out the folio part of zap_huge_pmd()
  mm/huge_memory: use mm instead of tlb->mm
  mm/huge_memory: remove unnecessary sanity checks
  mm/huge_memory: deduplicate zap deposited table call
  mm/huge_memory: remove unnecessary VM_BUG_ON_PAGE()
  mm/huge_memory: add a common exit path to zap_huge_pmd()
  mm/huge_memory: handle buggy PMD entry in zap_huge_pmd()
  mm/huge_memory: have zap_huge_pmd return a boolean, add kdoc
  mm/huge: avoid big else branch in zap_huge_pmd()
  mm/huge_memory: simplify vma_is_specal_huge()
  mm: on remap assert that input range within the proposed VMA
  mm: add mmap_action_map_kernel_pages[_full]()
  uio: replace deprecated mmap hook with mmap_prepare in uio_info
  drivers: hv: vmbus: replace deprecated mmap hook with mmap_prepare
  mm: allow handling of stacked mmap_prepare hooks in more drivers
  ...
 2026-04-15 12:59:16 -07:00
Linus Torvalds
4a57e0913e drm for v7.1-rc1 
mm:
 - two pass MMU interval notifiers
 - add gpu active/reclaim per-node stat counters
 
 math:
 - provide __KERNEL_DIV_ROUND_CLOSEST() in UAPI
 - implement DIV_ROUND_CLOSEST() with __KERNEL_DIV_ROUND_CLOSEST()
 
 rust:
 - shared tag with driver-core: register macro and io infra
 - core: rework DMA coherent API
 - core: add interop::list to interop with C linked lists
 - core: add more num::Bounded operations
 - core: enable generic_arg_infer and add EMSGSIZE
 - workqueue: add ARef<T> support for work and delayed work
 - add GPU buddy allocator abstraction
 - add DRM shmem GEM helper abstraction
 - allow drm:::Device to dispatch work and delayed work items
   to driver private data
 - add dma_resv_lock helper and raw accessors
 
 core:
 - introduce DRM RAS infrastructure over netlink
 - add connector panel_type property
 - fourcc: add ARM interleaved 64k modifier
 - colorop: add destroy helper
 - suballoc: split into alloc and init helpers
 - mode: provide DRM_ARGB_GET*() macros for reading color components
 
 edid:
 - provide drm_output_color_Format
 
 dma-buf:
 - provide revoke mechanism for shared buffers
 - rename move_notify to invalidate_mappings
 - always enable move_notify
 - protect dma_fence_ops with RCU and improve locking
 - clean pages with helpers
 
 atomic:
 - allocate drm_private_state via callback
 - helper: use system_percpu_wq
 
 buddy:
 - make buddy allocator available to gpu level
 - add kernel-doc for buddy allocator
 - improve aligned allocation
 
 ttm:
 - fix fence signalling
 - improve tests and docs
 - improve handling of gfp_retry_mayfail
 - use per-node stat counters to track memory allocations
 - port pool to use list_lru
 - drop NUMA specific pools
 - make pool shrinker numa aware
 - track allocated pages per numa node
 
 coreboot:
 - cleanup coreboot framebuffer support
 
 sched:
 - fix race condition in drm_sched_fini
 
 pagemap:
 - enable THP support
 - pass pagemap_addr by reference
 
 gem-shmem:
 - Track page accessed/dirty status across mmap/vmap
 
 gpusvm:
 - reenable device to device migration
 - fix unbalanced unclock
 
 bridge:
 - anx7625: Support USB-C plus DT bindings
 - connector: Fix EDID detection
 - dw-hdmi-qp: Support Vendor-Specfic and SDP Infoframes; improve others
 - fsl-ldb: Fix visual artifacts plus related DT property 'enable-termination-resistor'
 - imx8qxp-pixel-link: Improve bridge reference handling
 - lt9611: Support Port-B-only input plus DT bindings
 - tda998x: Support DRM_BRIDGE_ATTACH_NO_CONNECTOR; Clean up
 - Support TH1520 HDMI plus DT bindings
 - waveshare-dsi: Fix register and attach; Support 1..4 DSI lanes plus DT bindings
 - anx7625: Fix USB Type-C handling
 - cdns-mhdp8546-core: Handle HDCP state in bridge atomic_check
 - Support Lontium LT8713SX DP MST bridge plus DT bindings
 - analogix_dp: Use DP helpers for link training
 
 panel:
 - panel-jdi-lt070me05000: Use mipi-dsi multi functions
 - panel-edp: Support Add AUO B116XAT04.1 (HW: 1A); Support CMN N116BCL-EAK (C2); Support FriendlyELEC plus DT changes
 - panel-edp: Fix timings for BOE NV140WUM-N64
 - ilitek-ili9882t: Allow GPIO calls to sleep
 - jadard: Support TAIGUAN XTI05101-01A
 - lxd: Support LXD M9189A plus DT bindings
 - mantix: Fix pixel clock; Clean up
 - motorola: Support Motorola Atrix 4G and Droid X2 plus DT bindings
 - novatek: Support Novatek/Tianma NT37700F plus DT bindings
 - simple: Support EDT ET057023UDBA plus DT bindings; Support Powertip
   PH800480T032-ZHC19 plus DT bindings; Support Waveshare 13.3"
 - novatek-nt36672a: Use mipi_dsi_*_multi() functions
 - panel-edp: Support BOE NV153WUM-N42, CMN N153JCA-ELK, CSW MNF307QS3-2
 - support Himax HX83121A plus DT bindings
 - support JuTouch JT070TM041 plus DT bindings
 - support Samsung S6E8FC0 plus DT bindings
 - himax-hx83102c: support Samsung S6E8FC0 plus DT bindings; support backlight
 - ili9806e: support Rocktech RK050HR345-CT106A plus DT bindings
 - simple: support Tianma TM050RDH03 plus DT bindings
 
 amdgpu:
 - enable DC by default on CIK APUs
 - userq fence ioctl param size fixes
 - set panel_type to OLED for eDP
 - refactor DC i2c code
 - FAMS2 update
 - rework ttm handling to allow multiple engines
 - DC DCE 6.x cleanup
 - DC support for NUTMEG/TRAVIS DP bridge
 - DCN 4.2 support
 - GC12 idle power fix for compute
 - use struct drm_edid in non-DC code
 - enable NV12/P010 support on primary planes
 - support newer IP discovery tables
 - VCN/JPEG 5.0.2 support
 - GC/MES 12.1 updates
 - USERQ fixes
 - add DC idle state manager
 - eDP DSC seamless boot
 
 amdkfd:
 - GC 12.1 updates
 - non 4K page fixes
 
 xe:
 - basic Xe3p_LPG and NVL-P enabling patches
 - allow VM_BIND decompress support
 - add purgeable buffer object support
 - add xe_vm_get_property_ioctl
 - restrict multi-lrc to VCS/VECS engines
 - allow disabling VM overcommit in fault mode
 - dGPU memory optimizations
 - Workaround cleanups and simplification
 - Allow VFs VRAM quote changes using sysfs
 - convert GT stats to per-cpu counters
 - pagefault refactors
 - enable multi-queue on xe3p_xpc
 - disable DCC on PTL
 - make MMIO communication more robust
 - disable D3Cold for BMG on specific platforms
 - vfio: improve FLR sync for Xe VFIO
 
 i915/display:
 - C10/C20/LT PHY PLL divider verification
 - use trans push mechanism to generate PSR frame change on LNL+
 - refactor DP DSC slice config
 - VGA decode refactoring
 - refactor DPT, gen2-4 overlay, masked field register macro helpers
 - refactor stolen memory allocation decisions
 - prepare for UHBR DP tunnels
 - refactor LT PHY PLL to use DPLL framework
 - implement register polling/waiting in display code
 - add shared stepping header between i915 and display
 
 i915:
 - fix potential overflow of shmem scatterlist length
 
 nouveau:
 - provide Z cull info to userspace
 - initial GA100 support
 - shutdown on PCI device shutdown
 
 nova-core:
 - harden GSP command queue
 - add support for large RPCs
 - simplify GSP sequencer and message handling
 - refactor falcon firmware handling
 - convert to new register macro
 - conver to new DMA coherent API
 - use checked arithmetic
 - add debugfs support for gsp-rm log buffers
 - fix aux device registration for multi-GPU
 
 msm:
 - CI:
   - Uprev mesa
   - Restore CI jobs for Qualcomm APQ8016 and APQ8096 devices
 - Core:
   - Switched to of_get_available_child_by_name()
 - DPU:
   - Fixes for DSC panels
   - Fixed brownout because of the frequency / OPP mismatch
   - Quad pipe preparation (not enabled yet)
   - Switched to virtual planes by default
   - Dropped VBIF_NRT support
   - Added support for Eliza platform
   - Reworked alpha handling
   - Switched to correct CWB definitions on Eliza
   - Dropped dummy INTF_0 on MSM8953
   - Corrected INTFs related to DP-MST
 - DP:
   - Removed debug prints looking into PHY internals
 - DSI:
   - Fixes for DSC panels
   - RGB101010 support
   - Support for SC8280XP
   - Moved PHY bindings from display/ to phy/
 - GPU:
   - Preemption support for x2-85 and a840
   - IFPC support for a840
   - SKU detection support for x2-85 and a840
   - Expose AQE support (VK ray-pipeline)
   - Avoid locking in VM_BIND fence signaling path
   - Fix to avoid reclaim in GPU snapshot path
   - Disallow foreign mapping of _NO_SHARE BOs
 - HDMI:
   - Fixed infoframes programming
 - MDP5:
   - Dropped support for MSM8974v1
   - Dropped now unused code for MSM8974 v1 and SDM660 / MSM8998
 
 panthor:
 - add tracepoints for power and IRQs
 - fix fence handling
 - extend timestamp query with flags
 - support various sources for timestamp queries
 
 tyr:
 - fix names and model/versions
 
 rockchip:
 - vop2: use drm logging function
 - rk3576 displayport support
 - support CRTC background color
 
 atmel-hlcdc:
 - support sana5d65 LCD controller
 
 tilcdc:
 - use DT bindings schema
 - use managed DRM interfaces
 - support DRM_BRIDGE_ATTACH_NO_CONNECTOR
 
 verisilicon:
 - support DC8200 + DT bindings
 
 virtgpu:
 - support PRIME import with 3D enabled
 
 komeda:
 - fix integer overflow in AFBC checks
 
 mcde:
 - improve bridge handling
 
 gma500:
 - use drm client buffer for fbdev framebuffer
 
 amdxdna:
 - add sensors ioctls
 - provide NPU power estimate
 - support column utilization sensor
 - allow forcing DMA through IOMMU IOVA
 - support per-BO mem usage queries
 - refactor GEM implementation
 
 ivpu:
 - update boot API to v3.29.4
 - limit per-user number of doorbells/contexts
 - perform engine reset on TDR error
 
 loongson:
 - replace custom code with drm_gem_ttm_dumb_map_offset()
 
 imx:
 - support planes behind the primary plane
 - fix bus-format selection
 
 vkms:
 - support CRTC background color
 
 v3d:
 - improve handling of struct v3d_stats
 
 komeda:
 - support Arm China Linlon D6 plus DT bindings
 
 imagination:
 - improve power-off sequence
 - support context-reset notification from firmware
 
 mediatek:
 - mtk_dsi: enable hs clock during pre-enable
 - Remove all conflicting aperture devices during probe
 - Add support for mt8167 display blocks
 -----BEGIN PGP SIGNATURE-----
 
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Merge tag 'drm-next-2026-04-15' of https://gitlab.freedesktop.org/drm/kernel

Pull drm updates from Dave Airlie:
 "Highlights:
   - new DRM RAS infrastructure using netlink
   - amdgpu: enable DC on CIK APUs, and more IP enablement, and more
     user queue work
   - xe: purgeable BO support, and new hw enablement
   - dma-buf : add revocable operations

  Full summary:

  mm:
   - two-pass MMU interval notifiers
   - add gpu active/reclaim per-node stat counters

  math:
   - provide __KERNEL_DIV_ROUND_CLOSEST() in UAPI
   - implement DIV_ROUND_CLOSEST() with __KERNEL_DIV_ROUND_CLOSEST()

  rust:
   - shared tag with driver-core: register macro and io infra
   - core: rework DMA coherent API
   - core: add interop::list to interop with C linked lists
   - core: add more num::Bounded operations
   - core: enable generic_arg_infer and add EMSGSIZE
   - workqueue: add ARef<T> support for work and delayed work
   - add GPU buddy allocator abstraction
   - add DRM shmem GEM helper abstraction
   - allow drm:::Device to dispatch work and delayed work items
     to driver private data
   - add dma_resv_lock helper and raw accessors

  core:
   - introduce DRM RAS infrastructure over netlink
   - add connector panel_type property
   - fourcc: add ARM interleaved 64k modifier
   - colorop: add destroy helper
   - suballoc: split into alloc and init helpers
   - mode: provide DRM_ARGB_GET*() macros for reading color components

  edid:
   - provide drm_output_color_Format

  dma-buf:
   - provide revoke mechanism for shared buffers
   - rename move_notify to invalidate_mappings
   - always enable move_notify
   - protect dma_fence_ops with RCU and improve locking
   - clean pages with helpers

  atomic:
   - allocate drm_private_state via callback
   - helper: use system_percpu_wq

  buddy:
   - make buddy allocator available to gpu level
   - add kernel-doc for buddy allocator
   - improve aligned allocation

  ttm:
   - fix fence signalling
   - improve tests and docs
   - improve handling of gfp_retry_mayfail
   - use per-node stat counters to track memory allocations
   - port pool to use list_lru
   - drop NUMA specific pools
   - make pool shrinker numa aware
   - track allocated pages per numa node

  coreboot:
   - cleanup coreboot framebuffer support

  sched:
   - fix race condition in drm_sched_fini

  pagemap:
   - enable THP support
   - pass pagemap_addr by reference

  gem-shmem:
   - Track page accessed/dirty status across mmap/vmap

  gpusvm:
   - reenable device to device migration
   - fix unbalanced unclock

  bridge:
   - anx7625: Support USB-C plus DT bindings
   - connector: Fix EDID detection
   - dw-hdmi-qp: Support Vendor-Specfic and SDP Infoframes; improve
     others
   - fsl-ldb: Fix visual artifacts plus related DT property
     'enable-termination-resistor'
   - imx8qxp-pixel-link: Improve bridge reference handling
   - lt9611: Support Port-B-only input plus DT bindings
   - tda998x: Support DRM_BRIDGE_ATTACH_NO_CONNECTOR; Clean up
   - Support TH1520 HDMI plus DT bindings
   - waveshare-dsi: Fix register and attach; Support 1..4 DSI lanes plus
     DT bindings
   - anx7625: Fix USB Type-C handling
   - cdns-mhdp8546-core: Handle HDCP state in bridge atomic_check
   - Support Lontium LT8713SX DP MST bridge plus DT bindings
   - analogix_dp: Use DP helpers for link training

  panel:
   - panel-jdi-lt070me05000: Use mipi-dsi multi functions
   - panel-edp: Support Add AUO B116XAT04.1 (HW: 1A); Support CMN
     N116BCL-EAK (C2); Support FriendlyELEC plus DT changes
   - panel-edp: Fix timings for BOE NV140WUM-N64
   - ilitek-ili9882t: Allow GPIO calls to sleep
   - jadard: Support TAIGUAN XTI05101-01A
   - lxd: Support LXD M9189A plus DT bindings
   - mantix: Fix pixel clock; Clean up
   - motorola: Support Motorola Atrix 4G and Droid X2 plus DT bindings
   - novatek: Support Novatek/Tianma NT37700F plus DT bindings
   - simple: Support EDT ET057023UDBA plus DT bindings; Support Powertip
     PH800480T032-ZHC19 plus DT bindings; Support Waveshare 13.3"
   - novatek-nt36672a: Use mipi_dsi_*_multi() functions
   - panel-edp: Support BOE NV153WUM-N42, CMN N153JCA-ELK, CSW
     MNF307QS3-2
   - support Himax HX83121A plus DT bindings
   - support JuTouch JT070TM041 plus DT bindings
   - support Samsung S6E8FC0 plus DT bindings
   - himax-hx83102c: support Samsung S6E8FC0 plus DT bindings; support
     backlight
   - ili9806e: support Rocktech RK050HR345-CT106A plus DT bindings
   - simple: support Tianma TM050RDH03 plus DT bindings

  amdgpu:
   - enable DC by default on CIK APUs
   - userq fence ioctl param size fixes
   - set panel_type to OLED for eDP
   - refactor DC i2c code
   - FAMS2 update
   - rework ttm handling to allow multiple engines
   - DC DCE 6.x cleanup
   - DC support for NUTMEG/TRAVIS DP bridge
   - DCN 4.2 support
   - GC12 idle power fix for compute
   - use struct drm_edid in non-DC code
   - enable NV12/P010 support on primary planes
   - support newer IP discovery tables
   - VCN/JPEG 5.0.2 support
   - GC/MES 12.1 updates
   - USERQ fixes
   - add DC idle state manager
   - eDP DSC seamless boot

  amdkfd:
   - GC 12.1 updates
   - non 4K page fixes

  xe:
   - basic Xe3p_LPG and NVL-P enabling patches
   - allow VM_BIND decompress support
   - add purgeable buffer object support
   - add xe_vm_get_property_ioctl
   - restrict multi-lrc to VCS/VECS engines
   - allow disabling VM overcommit in fault mode
   - dGPU memory optimizations
   - Workaround cleanups and simplification
   - Allow VFs VRAM quote changes using sysfs
   - convert GT stats to per-cpu counters
   - pagefault refactors
   - enable multi-queue on xe3p_xpc
   - disable DCC on PTL
   - make MMIO communication more robust
   - disable D3Cold for BMG on specific platforms
   - vfio: improve FLR sync for Xe VFIO

  i915/display:
   - C10/C20/LT PHY PLL divider verification
   - use trans push mechanism to generate PSR frame change on LNL+
   - refactor DP DSC slice config
   - VGA decode refactoring
   - refactor DPT, gen2-4 overlay, masked field register macro helpers
   - refactor stolen memory allocation decisions
   - prepare for UHBR DP tunnels
   - refactor LT PHY PLL to use DPLL framework
   - implement register polling/waiting in display code
   - add shared stepping header between i915 and display

  i915:
   - fix potential overflow of shmem scatterlist length

  nouveau:
   - provide Z cull info to userspace
   - initial GA100 support
   - shutdown on PCI device shutdown

  nova-core:
   - harden GSP command queue
   - add support for large RPCs
   - simplify GSP sequencer and message handling
   - refactor falcon firmware handling
   - convert to new register macro
   - conver to new DMA coherent API
   - use checked arithmetic
   - add debugfs support for gsp-rm log buffers
   - fix aux device registration for multi-GPU

  msm:
   - CI:
      - Uprev mesa
      - Restore CI jobs for Qualcomm APQ8016 and APQ8096 devices
   - Core:
      - Switched to of_get_available_child_by_name()
   - DPU:
      - Fixes for DSC panels
      - Fixed brownout because of the frequency / OPP mismatch
      - Quad pipe preparation (not enabled yet)
      - Switched to virtual planes by default
      - Dropped VBIF_NRT support
      - Added support for Eliza platform
      - Reworked alpha handling
      - Switched to correct CWB definitions on Eliza
      - Dropped dummy INTF_0 on MSM8953
      - Corrected INTFs related to DP-MST
   - DP:
      - Removed debug prints looking into PHY internals
   - DSI:
      - Fixes for DSC panels
      - RGB101010 support
      - Support for SC8280XP
      - Moved PHY bindings from display/ to phy/
   - GPU:
      - Preemption support for x2-85 and a840
      - IFPC support for a840
      - SKU detection support for x2-85 and a840
      - Expose AQE support (VK ray-pipeline)
      - Avoid locking in VM_BIND fence signaling path
      - Fix to avoid reclaim in GPU snapshot path
      - Disallow foreign mapping of _NO_SHARE BOs
   - HDMI:
      - Fixed infoframes programming
   - MDP5:
      - Dropped support for MSM8974v1
      - Dropped now unused code for MSM8974 v1 and SDM660 / MSM8998

  panthor:
   - add tracepoints for power and IRQs
   - fix fence handling
   - extend timestamp query with flags
   - support various sources for timestamp queries

  tyr:
   - fix names and model/versions

  rockchip:
   - vop2: use drm logging function
   - rk3576 displayport support
   - support CRTC background color

  atmel-hlcdc:
   - support sana5d65 LCD controller

  tilcdc:
   - use DT bindings schema
   - use managed DRM interfaces
   - support DRM_BRIDGE_ATTACH_NO_CONNECTOR

  verisilicon:
   - support DC8200 + DT bindings

  virtgpu:
   - support PRIME import with 3D enabled

  komeda:
   - fix integer overflow in AFBC checks

  mcde:
   - improve bridge handling

  gma500:
   - use drm client buffer for fbdev framebuffer

  amdxdna:
   - add sensors ioctls
   - provide NPU power estimate
   - support column utilization sensor
   - allow forcing DMA through IOMMU IOVA
   - support per-BO mem usage queries
   - refactor GEM implementation

  ivpu:
   - update boot API to v3.29.4
   - limit per-user number of doorbells/contexts
   - perform engine reset on TDR error

  loongson:
   - replace custom code with drm_gem_ttm_dumb_map_offset()

  imx:
   - support planes behind the primary plane
   - fix bus-format selection

  vkms:
   - support CRTC background color

  v3d:
   - improve handling of struct v3d_stats

  komeda:
   - support Arm China Linlon D6 plus DT bindings

  imagination:
   - improve power-off sequence
   - support context-reset notification from firmware

  mediatek:
   - mtk_dsi: enable hs clock during pre-enable
   - Remove all conflicting aperture devices during probe
   - Add support for mt8167 display blocks"

* tag 'drm-next-2026-04-15' of https://gitlab.freedesktop.org/drm/kernel: (1735 commits)
  drm/ttm/tests: Remove checks from ttm_pool_free_no_dma_alloc
  drm/ttm/tests: fix lru_count ASSERT
  drm/vram: remove DRM_VRAM_MM_FILE_OPERATIONS from docs
  drm/fb-helper: Fix a locking bug in an error path
  dma-fence: correct kernel-doc function parameter @flags
  ttm/pool: track allocated_pages per numa node.
  ttm/pool: make pool shrinker NUMA aware (v2)
  ttm/pool: drop numa specific pools
  ttm/pool: port to list_lru. (v2)
  drm/ttm: use gpu mm stats to track gpu memory allocations. (v4)
  mm: add gpu active/reclaim per-node stat counters (v2)
  gpu: nova-core: fix missing colon in SEC2 boot debug message
  gpu: nova-core: vbios: use from_le_bytes() for PCI ROM header parsing
  gpu: nova-core: bitfield: fix broken Default implementation
  gpu: nova-core: falcon: pad firmware DMA object size to required block alignment
  gpu: nova-core: gsp: fix undefined behavior in command queue code
  drm/shmem_helper: Make sure PMD entries get the writeable upgrade
  accel/ivpu: Trigger recovery on TDR with OS scheduling
  drm/msm: Use of_get_available_child_by_name()
  dt-bindings: display/msm: move DSI PHY bindings to phy/ subdir
  ...
 2026-04-15 08:45:00 -07:00
Linus Torvalds
fabd5a8d24 — Add return value descriptions to several internal functions, addressing 
kernel-doc complaints
 
 — Add the x86 maintainer mailing list to the resctrl section so they are
   automatically included in patch submissions, and reference the applicable
   contribution rules document
 
 — Allow users to apply a single Capacity Bitmask to all cache domains at once
   using '*' as a shorthand, instead of having to specify each domain
   individually. This is particularly user-friendly on high core-count systems
   with many cache clusters
 
 - When a user provides a non-existent domain ID while configuring cache
   allocation, ensure the failure reason is properly reported to the user
   rather than silently returning an error with a misleading "ok" status
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Merge tag 'x86_cache_for_v7.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 resource control updates from Borislav Petkov:

 - Add return value descriptions to several internal functions,
   addressing kernel-doc complaints

 - Add the x86 maintainer mailing list to the resctrl section so they
   are automatically included in patch submissions, and reference the
   applicable contribution rules document

 - Allow users to apply a single Capacity Bitmask to all cache domains
   at once using '*' as a shorthand, instead of having to specify each
   domain individually. This is particularly user-friendly on high
   core-count systems with many cache clusters

 - When a user provides a non-existent domain ID while configuring cache
   allocation, ensure the failure reason is properly reported to the
   user rather than silently returning an error with a misleading "ok"
   status

* tag 'x86_cache_for_v7.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  fs/resctrl: Add missing return value descriptions
  MAINTAINERS: Update resctrl entry
  fs/resctrl: Add "*" shorthand to set io_alloc CBM for all domains
  fs/resctrl: Report invalid domain ID when parsing io_alloc_cbm
 2026-04-14 14:46:37 -07:00
Linus Torvalds
5181afcdf9 A busier cycle than I had expected for docs, including: 
- Translations: some overdue updates to the Japanese translations, Chinese
   translations for some of the Rust documentation, and the beginnings of a
   Portuguese translation.
 
 - New documents covering CPU isolation, managed interrupts, debugging
   Python gbb scripts, and more.
 
 - More tooling work from Mauro, reducing docs-build warnings, adding self
   tests, improving man-page output, bringing in a proper C tokenizer to
   replace (some of) the mess of kernel-doc regexes, and more.
 
 - Update and synchronize changes.rst and scripts/ver_linux, and put both
   into alphabetical order.
 
 ...and a long list of documentation updates, typo fixes, and general
 improvements.
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Merge tag 'docs-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux

Pull documentation updates from Jonathan Corbet:
 "A busier cycle than I had expected for docs, including:

   - Translations: some overdue updates to the Japanese translations,
     Chinese translations for some of the Rust documentation, and the
     beginnings of a Portuguese translation.

   - New documents covering CPU isolation, managed interrupts, debugging
     Python gbb scripts, and more.

   - More tooling work from Mauro, reducing docs-build warnings, adding
     self tests, improving man-page output, bringing in a proper C
     tokenizer to replace (some of) the mess of kernel-doc regexes, and
     more.

   - Update and synchronize changes.rst and scripts/ver_linux, and put
     both into alphabetical order.

  ... and a long list of documentation updates, typo fixes, and general
  improvements"

* tag 'docs-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: (162 commits)
  Documentation: core-api: real-time: correct spelling
  doc: Add CPU Isolation documentation
  Documentation: Add managed interrupts
  Documentation: seq_file: drop 2.6 reference
  docs/zh_CN: update rust/index.rst translation
  docs/zh_CN: update rust/quick-start.rst translation
  docs/zh_CN: update rust/coding-guidelines.rst translation
  docs/zh_CN: update rust/arch-support.rst translation
  docs/zh_CN: sync process/2.Process.rst with English version
  docs/zh_CN: fix an inconsistent statement in dev-tools/testing-overview
  tracing: Documentation: Update histogram-design.rst for fn() handling
  docs: sysctl: Add documentation for /proc/sys/xen/
  Docs: hid: intel-ish-hid: make long URL usable
  Documentation/kernel-parameters: fix architecture alignment for pt, nopt, and nobypass
  sched/doc: Update yield_task description in sched-design-CFS
  Documentation/rtla: Convert links to RST format
  docs: fix typos and duplicated words across documentation
  docs: fix typo in zoran driver documentation
  docs: add an Assisted-by mention to submitting-patches.rst
  Revert "scripts/checkpatch: add Assisted-by: tag validation"
  ...
 2026-04-14 08:47:08 -07:00
Linus Torvalds
ef3da345cc vfs-7.1-rc1.misc 
Please consider pulling these changes from the signed vfs-7.1-rc1.misc tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "Features:
   - coredump: add tracepoint for coredump events
   - fs: hide file and bfile caches behind runtime const machinery

  Fixes:
   - fix architecture-specific compat_ftruncate64 implementations
   - dcache: Limit the minimal number of bucket to two
   - fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
   - fs/mbcache: cancel shrink work before destroying the cache
   - dcache: permit dynamic_dname()s up to NAME_MAX

  Cleanups:
   - remove or unexport unused fs_context infrastructure
   - trivial ->setattr cleanups
   - selftests/filesystems: Assume that TIOCGPTPEER is defined
   - writeback: fix kernel-doc function name mismatch for wb_put_many()
   - autofs: replace manual symlink buffer allocation in autofs_dir_symlink
   - init/initramfs.c: trivial fix: FSM -> Finite-state machine
   - fs: remove stale and duplicate forward declarations
   - readdir: Introduce dirent_size()
   - fs: Replace user_access_{begin/end} by scoped user access
   - kernel: acct: fix duplicate word in comment
   - fs: write a better comment in step_into() concerning .mnt assignment
   - fs: attr: fix comment formatting and spelling issues"

* tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (28 commits)
  dcache: permit dynamic_dname()s up to NAME_MAX
  fs: attr: fix comment formatting and spelling issues
  fs: hide file and bfile caches behind runtime const machinery
  fs: write a better comment in step_into() concerning .mnt assignment
  proc: rename proc_notify_change to proc_setattr
  proc: rename proc_setattr to proc_nochmod_setattr
  affs: rename affs_notify_change to affs_setattr
  adfs: rename adfs_notify_change to adfs_setattr
  hfs: update comments on hfs_inode_setattr
  kernel: acct: fix duplicate word in comment
  fs: Replace user_access_{begin/end} by scoped user access
  readdir: Introduce dirent_size()
  coredump: add tracepoint for coredump events
  fs: remove do_sys_truncate
  fs: pass on FTRUNCATE_* flags to do_truncate
  fs: fix archiecture-specific compat_ftruncate64
  fs: remove stale and duplicate forward declarations
  init/initramfs.c: trivial fix: FSM -> Finite-state machine
  autofs: replace manual symlink buffer allocation in autofs_dir_symlink
  fs/mbcache: cancel shrink work before destroying the cache
  ...
 2026-04-13 14:20:11 -07:00
Linus Torvalds
3383589700 vfs-7.1-rc1.directory 
Please consider pulling these changes from the signed vfs-7.1-rc1.directory tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.1-rc1.directory' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs directory updates from Christian Brauner:
 "Recently 'start_creating', 'start_removing', 'start_renaming' and
  related interfaces were added which combine the locking and the
  lookup.

  At that time many callers were changed to use the new interfaces.
  However there are still an assortment of places out side of the core
  vfs where the directory is locked explictly, whether with inode_lock()
  or lock_rename() or similar. These were missed in the first pass for
  an assortment of uninteresting reasons.

  This addresses the remaining places where explicit locking is used,
  and changes them to use the new interfaces, or otherwise removes the
  explicit locking.

  The biggest changes are in overlayfs. The other changes are quite
  simple, though maybe the cachefiles changes is the least simple of
  those"

* tag 'vfs-7.1-rc1.directory' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  VFS: unexport lock_rename(), lock_rename_child(), unlock_rename()
  ovl: remove ovl_lock_rename_workdir()
  ovl: use is_subdir() for testing if one thing is a subdir of another
  ovl: change ovl_create_real() to get a new lock when re-opening created file.
  ovl: pass name buffer to ovl_start_creating_temp()
  cachefiles: change cachefiles_bury_object to use start_renaming_dentry()
  ovl: Simplify ovl_lookup_real_one()
  VFS: make lookup_one_qstr_excl() static.
  nfsd: switch purge_old() to use start_removing_noperm()
  selinux: Use simple_start_creating() / simple_done_creating()
  Apparmor: Use simple_start_creating() / simple_done_creating()
  libfs: change simple_done_creating() to use end_creating()
  VFS: move the start_dirop() kerndoc comment to before start_dirop()
  fs/proc: Don't lock root inode when creating "self" and "thread-self"
  VFS: note error returns in documentation for various lookup functions
 2026-04-13 10:24:33 -07:00
Wolfram Sang
64cb68766f Documentation: seq_file: drop 2.6 reference 
Even kernels after 2.6 have seq-file support.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260410143234.43610-2-wsa+renesas@sang-engineering.com>
 2026-04-10 08:39:08 -06:00
Dave Airlie
2232ba9c79 mm: add gpu active/reclaim per-node stat counters (v2) 
While discussing memcg intergration with gpu memory allocations,
it was pointed out that there was no numa/system counters for
GPU memory allocations.

With more integrated memory GPU server systems turning up, and
more requirements for memory tracking it seems we should start
closing the gap.

Add two counters to track GPU per-node system memory allocations.

The first is currently allocated to GPU objects, and the second
is for memory that is stored in GPU page pools that can be reclaimed,
by the shrinker.

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
 2026-04-08 06:52:47 +10:00
Lorenzo Stoakes (Oracle)
62c65fd740 mm: add mmap_action_map_kernel_pages[_full]() 
A user can invoke mmap_action_map_kernel_pages() to specify that the
mapping should map kernel pages starting from desc->start of a specified
number of pages specified in an array.

In order to implement this, adjust mmap_action_prepare() to be able to
return an error code, as it makes sense to assert that the specified
parameters are valid as quickly as possible as well as updating the VMA
flags to include VMA_MIXEDMAP_BIT as necessary.

This provides an mmap_prepare equivalent of vm_insert_pages().  We
additionally update the existing vm_insert_pages() code to use
range_in_vma() and add a new range_in_vma_desc() helper function for the
mmap_prepare case, sharing the code between the two in range_is_subset().

We add both mmap_action_map_kernel_pages() and
mmap_action_map_kernel_pages_full() to allow for both partial and full VMA
mappings.

We update the documentation to reflect the new features.

Finally, we update the VMA tests accordingly to reflect the changes.

Link: https://lkml.kernel.org/r/926ac961690d856e67ec847bee2370ab3c6b9046.1774045440.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bodo Stroesser <bostroesser@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Long Li <longli@microsoft.com>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Richard Weinberger <richard@nod.at>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2026-04-05 13:53:45 -07:00
Lorenzo Stoakes (Oracle)
a1b7fb40cb mm: add mmap_action_simple_ioremap() 
Currently drivers use vm_iomap_memory() as a simple helper function for
I/O remapping memory over a range starting at a specified physical address
over a specified length.

In order to utilise this from mmap_prepare, separate out the core logic
into __simple_ioremap_prep(), update vm_iomap_memory() to use it, and add
simple_ioremap_prepare() to do the same with a VMA descriptor object.

We also add MMAP_SIMPLE_IO_REMAP and relevant fields to the struct
mmap_action type to permit this operation also.

We use mmap_action_ioremap() to set up the actual I/O remap operation once
we have checked and figured out the parameters, which makes
simple_ioremap_prepare() easy to implement.

We then add mmap_action_simple_ioremap() to allow drivers to make use of
this mode.

We update the mmap_prepare documentation to describe this mode.  Finally,
we update the VMA tests to reflect this change.

Link: https://lkml.kernel.org/r/a08ef1c4542202684da63bb37f459d5dbbeddd91.1774045440.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bodo Stroesser <bostroesser@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Long Li <longli@microsoft.com>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Richard Weinberger <richard@nod.at>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2026-04-05 13:53:43 -07:00
Lorenzo Stoakes (Oracle)
c50ca15dd4 mm: add vm_ops->mapped hook 
Previously, when a driver needed to do something like establish a
reference count, it could do so in the mmap hook in the knowledge that the
mapping would succeed.

With the introduction of f_op->mmap_prepare this is no longer the case, as
it is invoked prior to actually establishing the mapping.

mmap_prepare is not appropriate for this kind of thing as it is called
before any merge might take place, and after which an error might occur
meaning resources could be leaked.

To take this into account, introduce a new vm_ops->mapped callback which
is invoked when the VMA is first mapped (though notably - not when it is
merged - which is correct and mirrors existing mmap/open/close behaviour).

We do better that vm_ops->open() here, as this callback can return an
error, at which point the VMA will be unmapped.

Note that vm_ops->mapped() is invoked after any mmap action is complete
(such as I/O remapping).

We intentionally do not expose the VMA at this point, exposing only the
fields that could be used, and an output parameter in case the operation
needs to update the vma->vm_private_data field.

In order to deal with stacked filesystems which invoke inner filesystem's
mmap() invocations, add __compat_vma_mapped() and invoke it on vfs_mmap()
(via compat_vma_mmap()) to ensure that the mapped callback is handled when
an mmap() caller invokes a nested filesystem's mmap_prepare() callback.

Update the mmap_prepare documentation to describe the mapped hook and make
it clear what its intended use is.

The vm_ops->mapped() call is handled by the mmap complete logic to ensure
the same code paths are handled by both the compatibility and VMA layers.

Additionally, update VMA userland test headers to reflect the change.

Link: https://lkml.kernel.org/r/4c5e98297eb0aae9565c564e1c296a112702f144.1774045440.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bodo Stroesser <bostroesser@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Long Li <longli@microsoft.com>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Richard Weinberger <richard@nod.at>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2026-04-05 13:53:43 -07:00
Lorenzo Stoakes (Oracle)
fdd2478413 mm: add documentation for the mmap_prepare file operation callback 
This documentation makes it easier for a driver/file system implementer to
correctly use this callback.

It covers the fundamentals, whilst intentionally leaving the less lovely
possible actions one might take undocumented (for instance - the
success_hook, error_hook fields in mmap_action).

The document also covers the new VMA flags implementation which is the
only one which will work correctly with mmap_prepare.

Link: https://lkml.kernel.org/r/3aebf918c213fa2aecf00a31a444119b5bdd7801.1774045440.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bodo Stroesser <bostroesser@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Long Li <longli@microsoft.com>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Richard Weinberger <richard@nod.at>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2026-04-05 13:53:42 -07:00
Al Viro
408d8af01f for_each_alias(): helper macro for iterating through dentries of given inode 
Most of the places using d_alias are loops iterating through all aliases for
given inode; introduce a helper macro (for_each_alias(dentry, inode))
and convert open-coded instances of such loop to it.

They are easier to read that way and it reduces the noise on the next steps.

You _must_ hold inode->i_lock over that thing.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
 2026-04-02 03:45:02 -04:00
Aaron Tomlin
d2bf45d067 fs/resctrl: Add "*" shorthand to set io_alloc CBM for all domains 
Configuring the io_alloc_cbm interface requires an explicit domain ID for each
cache domain. On systems with high core counts and numerous cache clusters,
this requirement becomes cumbersome for automation and management tasks that
aim to apply a uniform policy.

Introduce a wildcard domain ID selector "*" for the io_alloc_cbm interface.
This enables users to set the same Capacity Bitmask (CBM) across all cache
domains in a single operation.

Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://patch.msgid.link/20260325001159.447075-3-atomlin@atomlin.com
 2026-04-02 00:22:59 +02:00
Zenghui Yu (Huawei)
4663a5a2a3 docs: proc: remove description of prof_cpu_mask 
Commit 2e5449f4f2 ("profiling: Remove create_prof_cpu_mask().") said that
no one would create /proc/irq/prof_cpu_mask since commit 1f44a22577
("s390: convert interrupt handling to use generic hardirq", 2013). Remove
the outdated description.

While at it, fix another minor typo (s/DMS/DMA/).

Signed-off-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260311070940.94838-1-zenghui.yu@linux.dev>
 2026-03-30 11:02:29 -06:00
Benjamin Coddington
2a83ffc557 NFSD: Sign filehandles 
NFS clients may bypass restrictive directory permissions by using
open_by_handle() (or other available OS system call) to guess the
filehandles for files below that directory.

In order to harden knfsd servers against this attack, create a method to
sign and verify filehandles using SipHash-2-4 as a MAC (Message
Authentication Code).  According to
https://cr.yp.to/siphash/siphash-20120918.pdf, SipHash can be used as a
MAC, and our use of SipHash-2-4 provides a low 1 in 2^64 chance of forgery.

Filehandles that have been signed cannot be tampered with, nor can
clients reasonably guess correct filehandles and hashes that may exist in
parts of the filesystem they cannot access due to directory permissions.

Append the 8 byte SipHash to encoded filehandles for exports that have set
the "sign_fh" export option.  Filehandles received from clients are
verified by comparing the appended hash to the expected hash.  If the MAC
does not match the server responds with NFS error _STALE.  If unsigned
filehandles are received for an export with "sign_fh" they are rejected
with NFS error _STALE.

Signed-off-by: Benjamin Coddington <bcodding@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
 2026-03-29 21:25:09 -04:00
Dai Ngo
f52792f484 NFSD: Enforce timeout on layout recall and integrate lease manager fencing 
When a layout conflict triggers a recall, enforcing a timeout is
necessary to prevent excessive nfsd threads from being blocked in
__break_lease ensuring the server continues servicing incoming
requests efficiently.

This patch introduces a new function to lease_manager_operations:

lm_breaker_timedout: Invoked when a lease recall times out and is
about to be disposed of. This function enables the lease manager
to inform the caller whether the file_lease should remain on the
flc_list or be disposed of.

For the NFSD lease manager, this function now handles layout recall
timeouts. If the layout type supports fencing and the client has not
been fenced, a fence operation is triggered to prevent the client
from accessing the block device.

While the fencing operation is in progress, the conflicting file_lease
remains on the flc_list until fencing is complete. This guarantees
that no other clients can access the file, and the client with
exclusive access is properly blocked before disposal.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
 2026-03-29 21:25:09 -04:00
Fei Lv
1f6ee9be92 ovl: make fsync after metadata copy-up opt-in mount option 
Commit 7d6899fb69 ("ovl: fsync after metadata copy-up") was done to
fix durability of overlayfs copy up on an upper filesystem which does
not enforce ordering on storing of metadata changes (e.g. ubifs).

In an earlier revision of the regressing commit by Lei Lv, the metadata
fsync behavior was opt-in via a new "fsync=strict" mount option.
We were hoping that the opt-in mount option could be avoided, so the
change was only made to depend on metacopy=off, in the hope of not
hurting performance of metadata heavy workloads, which are more likely
to be using metacopy=on.

This hope was proven wrong by a performance regression report from Google
COS workload after upgrade to kernel 6.12.

This is an adaptation of Lei's original "fsync=strict" mount option
to the existing upstream code.

The new mount option is mutually exclusive with the "volatile" mount
option, so the latter is now an alias to the "fsync=volatile" mount
option.

Reported-by: Chenglong Tang <chenglongtang@google.com>
Closes: https://lore.kernel.org/linux-unionfs/CAOdxtTadAFH01Vui1FvWfcmQ8jH1O45owTzUcpYbNvBxnLeM7Q@mail.gmail.com/
Link: https://lore.kernel.org/linux-unionfs/CAOQ4uxgKC1SgjMWre=fUb00v8rxtd6sQi-S+dxR8oDzAuiGu8g@mail.gmail.com/
Fixes: 7d6899fb69 ("ovl: fsync after metadata copy-up")
Depends: 50e638beb6 ("ovl: Use str_on_off() helper in ovl_show_options()")
Cc: stable@vger.kernel.org # v6.12+
Signed-off-by: Fei Lv <feilv@asrmicro.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
 2026-03-27 12:48:10 +01:00
Daniel Tang
cae0e1bbde docs: path-lookup: fix unrenamed WALK_GET 
The symbol WALK_GET does not appears in the codebase as of
0031c06807. It was renamed as of 8f64fb1cce. A previous
documentation update, de9414adaf, renamed one occurrence in
path-lookup.rst, but forgot to change another occurrence later in the
file.

Fixes: de9414adaf ("docs: path-lookup: update WALK_GET, WALK_PUT desc")
Signed-off-by: Daniel Tang <danielzgtg.opensource@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <13011949.O9o76ZdvQC@daniel-desktop3>
 2026-03-22 14:54:23 -06:00
David Hildenbrand (Arm)
17eb360d7d docs: filesystems: clarify KernelPageSize vs. MMUPageSize in smaps 
There was recently some confusion around THPs and the interaction with
KernelPageSize / MMUPageSize. Historically, these entries always
correspond to the smallest size we could encounter, not any current
usage of transparent huge pages or larger sizes used by the MMU.

Ever since we added THP support many, many years ago, these entries
would keep reporting the smallest (fallback) granularity in a VMA.

For this reason, they default to PAGE_SIZE for all VMAs except for
VMAs where we have the guarantee that the system and the MMU will
always use larger page sizes. hugetlb, for example, exposes a custom
vm_ops->pagesize callback to handle that. Similarly, dax/device
exposes a custom vm_ops->pagesize callback and provides similar
guarantees.

Let's clarify the historical meaning of KernelPageSize / MMUPageSize,
and point at "AnonHugePages", "ShmemPmdMapped" and "FilePmdMapped"
regarding PMD entries.

While at it, document "FilePmdMapped", clarify what the "AnonHugePages"
and "ShmemPmdMapped" entries really mean, and make it clear that there
are no other entries for other THP/folio sizes or mappings.

Also drop the duplicate "KernelPageSize" and "MMUPageSize" entries in
the example.

Link: https://lore.kernel.org/all/20260225232708.87833-1-ak@linux.intel.com/
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Usama Arif <usamaarif642@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260306081916.38872-1-david@kernel.org>
 2026-03-09 10:13:51 -06:00
NeilBrown
4d94ce88c7
VFS: unexport lock_rename(), lock_rename_child(), unlock_rename() 
These three function are now only used in namei.c, so they don't need to
be exported.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://patch.msgid.link/20260224222542.3458677-16-neilb@ownmail.net
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2026-03-09 09:43:04 +01:00
NeilBrown
336faf5d91
VFS: make lookup_one_qstr_excl() static. 
lookup_one_qstr_excl() is no longer used outside of namei.c, so
make it static.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://patch.msgid.link/20260224222542.3458677-9-neilb@ownmail.net
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2026-03-06 10:24:12 +01:00
Randy Dunlap
9b4253cd63 ntfs: repair docum. malformed table 
Make the top and bottom borders be that same length to
avoid a documentation build error:

Documentation/filesystems/ntfs.rst:159: ERROR: Malformed table.
Bottom border or header rule does not match top border.

(top)
======================= ===================================================
(bottom)
======================= ==================================================

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
 2026-02-26 18:26:07 +09:00
Christoph Hellwig
d2f2f7cf8e
fs: remove fsparam_path / fs_param_is_path 
These are not used anywhere even after the fs_context conversion is
finished, so remove them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260219065014.3550402-4-hch@lst.de
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2026-02-19 14:34:26 +01:00
Christoph Hellwig
8823db2974
fs: remove fsparam_blob / fs_param_is_blob 
These are not used anywhere even after the fs_context conversion is
finished, so remove them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260219065014.3550402-3-hch@lst.de
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2026-02-19 14:34:26 +01:00
Namjae Jeon
ab00f20ab6 Documentation: filesystems: update NTFS driver documentation 
Update the NTFS driver documentation to reflect the update implementation.
Remove outdated sections (web site, old features list, known bugs,
volume/stripe sets with MD/DM driver, limitations of old driver), add a
concise overview of current driver features and long-term maintenance
focus, add a utilities support section pointing to ntfsprogs-plus project
and update mount options list with current supported options.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
 2026-02-19 21:51:03 +09:00
Namjae Jeon
1e9ea7e044 Revert "fs: Remove NTFS classic" 
This reverts commit 7ffa8f3d30.

Reverts the removal of the classic read-only ntfs driver to
serve as the base for a new read-write ntfs implementation.
If we stack changes on top of the revert patch, It will significantly
reduce the diff size, making the review easier.

This revert intentionally excludes the restoration of Kconfig and
Makefile. The Kconfig and Makefile will be added back in the final patch
of this series, enabling the driver only after all features and
improvements have been applied.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
 2026-02-19 21:48:05 +09:00
Linus Torvalds
0ba83f0968 overlayfs updates for 7.0 
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Merge tag 'ovl-update-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs

Pull overlayfs update from Amir Goldstein:
 "Relax the semantics of uuid=off to cater to a use case of overlayfs
  lower layers on btrfs clones, whose UUID are ephemeral and an upper
  layer on a different filesystem"

* tag 'ovl-update-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
  ovl: relax requirement for uuid=off,index=on
 2026-02-17 15:08:24 -08:00
Linus Torvalds
45a43ac5ac vfs-7.0-rc1.misc.2 
Please consider pulling these changes from the signed vfs-7.0-rc1.misc.2 tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.misc.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull more misc vfs updates from Christian Brauner:
 "Features:

   - Optimize close_range() from O(range size) to O(active FDs) by using
     find_next_bit() on the open_fds bitmap instead of linearly scanning
     the entire requested range. This is a significant improvement for
     large-range close operations on sparse file descriptor tables.

   - Add FS_XFLAG_VERITY file attribute for fs-verity files, retrievable
     via FS_IOC_FSGETXATTR and file_getattr(). The flag is read-only.
     Add tracepoints for fs-verity enable and verify operations,
     replacing the previously removed debug printk's.

   - Prevent nfsd from exporting special kernel filesystems like pidfs
     and nsfs. These filesystems have custom ->open() and ->permission()
     export methods that are designed for open_by_handle_at(2) only and
     are incompatible with nfsd. Update the exportfs documentation
     accordingly.

  Fixes:

   - Fix KMSAN uninit-value in ovl_fill_real() where strcmp() was used
     on a non-null-terminated decrypted directory entry name from
     fscrypt. This triggered on encrypted lower layers when the
     decrypted name buffer contained uninitialized tail data.

     The fix also adds VFS-level name_is_dot(), name_is_dotdot(), and
     name_is_dot_dotdot() helpers, replacing various open-coded "." and
     ".." checks across the tree.

   - Fix read-only fsflags not being reset together with xflags in
     vfs_fileattr_set(). Currently harmless since no read-only xflags
     overlap with flags, but this would cause inconsistencies for any
     future shared read-only flag

   - Return -EREMOTE instead of -ESRCH from PIDFD_GET_INFO when the
     target process is in a different pid namespace. This lets userspace
     distinguish "process exited" from "process in another namespace",
     matching glibc's pidfd_getpid() behavior

  Cleanups:

   - Use C-string literals in the Rust seq_file bindings, replacing the
     kernel::c_str!() macro (available since Rust 1.77)

   - Fix typo in d_walk_ret enum comment, add porting notes for the
     readlink_copy() calling convention change"

* tag 'vfs-7.0-rc1.misc.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  fs: add porting notes about readlink_copy()
  pidfs: return -EREMOTE when PIDFD_GET_INFO is called on another ns
  nfsd: do not allow exporting of special kernel filesystems
  exportfs: clarify the documentation of open()/permission() expotrfs ops
  fsverity: add tracepoints
  fs: add FS_XFLAG_VERITY for fs-verity files
  rust: seq_file: replace `kernel::c_str!` with C-Strings
  fs: dcache: fix typo in enum d_walk_ret comment
  ovl: use name_is_dot* helpers in readdir code
  fs: add helpers name_is_dot{,dot,_dotdot}
  ovl: Fix uninit-value in ovl_fill_real
  fs: reset read-only fsflags together with xflags
  fs/file: optimize close_range() complexity from O(N) to O(Sparse)
 2026-02-16 13:00:36 -08:00
Linus Torvalds
3e48a11675 f2fs-for-7.0-rc1 
In this development cycle, we focused on several key performance optimizations:
 1) introducing large folio support to enhance read speeds for immutable files,
 2) reducing checkpoint=enable latency by flushing only committed dirty pages,
 and 3) implementing tracepoints to diagnose and resolve lock priority inversion.
 Additionally, we introduced the packed_ssa feature to optimize the SSA footprint
 when utilizing large block sizes.
 
 Enhancement:
  - support large folio for immutable non-compressed case
  - support non-4KB block size without packed_ssa feature
  - optimize f2fs_enable_checkpoint() to avoid long delay
  - optimize f2fs_overwrite_io() for f2fs_iomap_begin
  - optimize NAT block loading during checkpoint write
  - add write latency stats for NAT and SIT blocks in f2fs_write_checkpoint
  - pin files do not require sbi->writepages lock for ordering
  - avoid f2fs_map_blocks() for consecutive holes in readpages
  - flush plug periodically during GC to maximize readahead effect
  - add tracepoints to catch lock overheads
  - add several sysfs entries to tune internal lock priorities
 
 Bug fix:
  - fix lock priority inversion issue
  - fix incomplete block usage in compact SSA summaries
  - fix to show simulate_lock_timeout correctly
  - fix to avoid mapping wrong physical block for swapfile
  - fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic
    commit and checkpoint writes
  - fix to avoid UAF in f2fs_write_end_io()
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Merge tag 'f2fs-for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs updates from Jaegeuk Kim:
 "In this development cycle, we focused on several key performance
  optimizations:

   - introducing large folio support to enhance read speeds for
     immutable files

   - reducing checkpoint=enable latency by flushing only committed dirty
     pages

   - implementing tracepoints to diagnose and resolve lock priority
     inversion.

  Additionally, we introduced the packed_ssa feature to optimize the SSA
  footprint when utilizing large block sizes.

  Detail summary:

  Enhancements:
   - support large folio for immutable non-compressed case
   - support non-4KB block size without packed_ssa feature
   - optimize f2fs_enable_checkpoint() to avoid long delay
   - optimize f2fs_overwrite_io() for f2fs_iomap_begin
   - optimize NAT block loading during checkpoint write
   - add write latency stats for NAT and SIT blocks in
     f2fs_write_checkpoint
   - pin files do not require sbi->writepages lock for ordering
   - avoid f2fs_map_blocks() for consecutive holes in readpages
   - flush plug periodically during GC to maximize readahead effect
   - add tracepoints to catch lock overheads
   - add several sysfs entries to tune internal lock priorities

  Fixes:
   - fix lock priority inversion issue
   - fix incomplete block usage in compact SSA summaries
   - fix to show simulate_lock_timeout correctly
   - fix to avoid mapping wrong physical block for swapfile
   - fix IS_CHECKPOINTED flag inconsistency issue caused by
     concurrent atomic commit and checkpoint writes
   - fix to avoid UAF in f2fs_write_end_io()"

* tag 'f2fs-for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (61 commits)
  f2fs: sysfs: introduce critical_task_priority
  f2fs: introduce trace_f2fs_priority_update
  f2fs: fix lock priority inversion issue
  f2fs: optimize f2fs_overwrite_io() for f2fs_iomap_begin
  f2fs: fix incomplete block usage in compact SSA summaries
  f2fs: decrease maximum flush retry count in f2fs_enable_checkpoint()
  f2fs: optimize NAT block loading during checkpoint write
  f2fs: change size parameter of __has_cursum_space() to unsigned int
  f2fs: add write latency stats for NAT and SIT blocks in f2fs_write_checkpoint
  f2fs: pin files do not require sbi->writepages lock for ordering
  f2fs: fix to show simulate_lock_timeout correctly
  f2fs: introduce FAULT_SKIP_WRITE
  f2fs: check skipped write in f2fs_enable_checkpoint()
  Revert "f2fs: add timeout in f2fs_enable_checkpoint()"
  f2fs: fix to unlock folio in f2fs_read_data_large_folio()
  f2fs: fix error path handling in f2fs_read_data_large_folio()
  f2fs: use folio_end_read
  f2fs: fix to avoid mapping wrong physical block for swapfile
  f2fs: avoid f2fs_map_blocks() for consecutive holes in readpages
  f2fs: advance index and offset after zeroing in large folio read
  ...
 2026-02-14 09:48:10 -08:00
Linus Torvalds
136114e0ab mm.git review status for linus..mm-nonmm-stable 
Total patches:       107
 Reviews/patch:       1.07
 Reviewed rate:       67%
 
 - The 2 patch series "ocfs2: give ocfs2 the ability to reclaim
   suballocator free bg" from Heming Zhao saves disk space by teaching
   ocfs2 to reclaim suballocator block group space.
 
 - The 4 patch series "Add ARRAY_END(), and use it to fix off-by-one
   bugs" from Alejandro Colomar adds the ARRAY_END() macro and uses it in
   various places.
 
 - The 2 patch series "vmcoreinfo: support VMCOREINFO_BYTES larger than
   PAGE_SIZE" from Pnina Feder makes the vmcore code future-safe, if
   VMCOREINFO_BYTES ever exceeds the page size.
 
 - The 7 patch series "kallsyms: Prevent invalid access when showing
   module buildid" from Petr Mladek cleans up kallsyms code related to
   module buildid and fixes an invalid access crash when printing
   backtraces.
 
 - The 3 patch series "Address page fault in
   ima_restore_measurement_list()" from Harshit Mogalapalli fixes a
   kexec-related crash that can occur when booting the second-stage kernel
   on x86.
 
 - The 6 patch series "kho: ABI headers and Documentation updates" from
   Mike Rapoport updates the kexec handover ABI documentation.
 
 - The 4 patch series "Align atomic storage" from Finn Thain adds the
   __aligned attribute to atomic_t and atomic64_t definitions to get
   natural alignment of both types on csky, m68k, microblaze, nios2,
   openrisc and sh.
 
 - The 2 patch series "kho: clean up page initialization logic" from
   Pratyush Yadav simplifies the page initialization logic in
   kho_restore_page().
 
 - The 6 patch series "Unload linux/kernel.h" from Yury Norov moves
   several things out of kernel.h and into more appropriate places.
 
 - The 7 patch series "don't abuse task_struct.group_leader" from Oleg
   Nesterov removes the usage of ->group_leader when it is "obviously
   unnecessary".
 
 - The 5 patch series "list private v2 & luo flb" from Pasha Tatashin
   adds some infrastructure improvements to the live update orchestrator.
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Merge tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - "ocfs2: give ocfs2 the ability to reclaim suballocator free bg" saves
   disk space by teaching ocfs2 to reclaim suballocator block group
   space (Heming Zhao)

 - "Add ARRAY_END(), and use it to fix off-by-one bugs" adds the
   ARRAY_END() macro and uses it in various places (Alejandro Colomar)

 - "vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE" makes
   the vmcore code future-safe, if VMCOREINFO_BYTES ever exceeds the
   page size (Pnina Feder)

 - "kallsyms: Prevent invalid access when showing module buildid" cleans
   up kallsyms code related to module buildid and fixes an invalid
   access crash when printing backtraces (Petr Mladek)

 - "Address page fault in ima_restore_measurement_list()" fixes a
   kexec-related crash that can occur when booting the second-stage
   kernel on x86 (Harshit Mogalapalli)

 - "kho: ABI headers and Documentation updates" updates the kexec
   handover ABI documentation (Mike Rapoport)

 - "Align atomic storage" adds the __aligned attribute to atomic_t and
   atomic64_t definitions to get natural alignment of both types on
   csky, m68k, microblaze, nios2, openrisc and sh (Finn Thain)

 - "kho: clean up page initialization logic" simplifies the page
   initialization logic in kho_restore_page() (Pratyush Yadav)

 - "Unload linux/kernel.h" moves several things out of kernel.h and into
   more appropriate places (Yury Norov)

 - "don't abuse task_struct.group_leader" removes the usage of
   ->group_leader when it is "obviously unnecessary" (Oleg Nesterov)

 - "list private v2 & luo flb" adds some infrastructure improvements to
   the live update orchestrator (Pasha Tatashin)

* tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (107 commits)
  watchdog/hardlockup: simplify perf event probe and remove per-cpu dependency
  procfs: fix missing RCU protection when reading real_parent in do_task_stat()
  watchdog/softlockup: fix sample ring index wrap in need_counting_irqs()
  kcsan, compiler_types: avoid duplicate type issues in BPF Type Format
  kho: fix doc for kho_restore_pages()
  tests/liveupdate: add in-kernel liveupdate test
  liveupdate: luo_flb: introduce File-Lifecycle-Bound global state
  liveupdate: luo_file: Use private list
  list: add kunit test for private list primitives
  list: add primitives for private list manipulations
  delayacct: fix uapi timespec64 definition
  panic: add panic_force_cpu= parameter to redirect panic to a specific CPU
  netclassid: use thread_group_leader(p) in update_classid_task()
  RDMA/umem: don't abuse current->group_leader
  drm/pan*: don't abuse current->group_leader
  drm/amd: kill the outdated "Only the pthreads threading model is supported" checks
  drm/amdgpu: don't abuse current->group_leader
  android/binder: use same_thread_group(proc->tsk, current) in binder_mmap()
  android/binder: don't abuse current->group_leader
  kho: skip memoryless NUMA nodes when reserving scratch areas
  ...
 2026-02-12 12:13:01 -08:00
Linus Torvalds
541c43310e \n 
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Merge tag 'fs_for_v6.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull quota and isofs updates from Jan Kara:

 - a fix for quotactl livelock during filesystem freezing

 - a small improvement for isofs

 - a documentation fix for ext2

* tag 'fs_for_v6.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  isofs: support full length file names (255 instead of 253)
  quota: fix livelock between quotactl and freeze_super
  doc : fix a broken link in ext2.rst
 2026-02-12 10:57:57 -08:00
Linus Torvalds
dcb4971018 - Extend the resctrl machinery to support telemetry monitoring on Intel. The 
practical usage of this is being able to tell how much energy or how much
   work can be attributed to a group of tasks tracked under a single
   idenitifier. Prepend this work with proper refactoring of resctrl domains
   handling code. Work by Tony Luck
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Merge tag 'x86_cache_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 resource control updates from Borislav Petkov:

 - Extend the resctrl machinery to support telemetry monitoring on
   Intel (Tony Luck)

   The practical usage of this is being able to tell how much energy or
   how much work can be attributed to a group of tasks tracked under a
   single idenitifier. Prepend this work with proper refactoring of
   resctrl domains handling code.

* tag 'x86_cache_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
  x86,fs/resctrl: Update documentation for telemetry events
  x86/resctrl: Enable RDT_RESOURCE_PERF_PKG
  fs/resctrl: Move RMID initialization to first mount
  x86,fs/resctrl: Compute number of RMIDs as minimum across resources
  fs/resctrl: Move allocation/free of closid_num_dirty_rmid[]
  x86/resctrl: Handle number of RMIDs supported by RDT_RESOURCE_PERF_PKG
  x86/resctrl: Add energy/perf choices to rdt boot option
  x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG
  fs/resctrl: Refactor rmdir_mondata_subdir_allrdtgrp()
  fs/resctrl: Refactor mkdir_mondata_subdir()
  x86/resctrl: Read telemetry events
  x86/resctrl: Find and enable usable telemetry events
  x86,fs/resctrl: Add architectural event pointer
  x86,fs/resctrl: Fill in details of events for performance and energy GUIDs
  x86/resctrl: Discover hardware telemetry events
  fs/resctrl: Emphasize that L3 monitoring resource is required for summing domains
  x86,fs/resctrl: Add and initialize a resource for package scope monitoring
  x86,fs/resctrl: Add an architectural hook called for first mount
  x86,fs/resctrl: Support binary fixed point event counters
  x86,fs/resctrl: Handle events that can be read from any CPU
  ...
 2026-02-10 18:24:56 -08:00
Linus Torvalds
13d83ea9d8 Crypto library updates for 7.0 
- Add support for verifying ML-DSA signatures.
 
   ML-DSA (Module-Lattice-Based Digital Signature Algorithm) is a
   recently-standardized post-quantum (quantum-resistant) signature
   algorithm. It was known as Dilithium pre-standardization.
 
   The first use case in the kernel will be module signing. But there
   are also other users of RSA and ECDSA signatures in the kernel that
   might want to upgrade to ML-DSA eventually.
 
 - Improve the AES library:
 
     - Make the AES key expansion and single block encryption and
       decryption functions use the architecture-optimized AES code.
       Enable these optimizations by default.
 
     - Support preparing an AES key for encryption-only, using about
       half as much memory as a bidirectional key.
 
     - Replace the existing two generic implementations of AES with a
       single one.
 
 - Simplify how Adiantum message hashing is implemented. Remove the
   "nhpoly1305" crypto_shash in favor of direct lib/crypto/ support for
   NH hashing, and enable optimizations by default.
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Merge tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

Pull crypto library updates from Eric Biggers:

 - Add support for verifying ML-DSA signatures.

   ML-DSA (Module-Lattice-Based Digital Signature Algorithm) is a
   recently-standardized post-quantum (quantum-resistant) signature
   algorithm. It was known as Dilithium pre-standardization.

   The first use case in the kernel will be module signing. But there
   are also other users of RSA and ECDSA signatures in the kernel that
   might want to upgrade to ML-DSA eventually.

 - Improve the AES library:

     - Make the AES key expansion and single block encryption and
       decryption functions use the architecture-optimized AES code.
       Enable these optimizations by default.

     - Support preparing an AES key for encryption-only, using about
       half as much memory as a bidirectional key.

     - Replace the existing two generic implementations of AES with a
       single one.

 - Simplify how Adiantum message hashing is implemented. Remove the
   "nhpoly1305" crypto_shash in favor of direct lib/crypto/ support for
   NH hashing, and enable optimizations by default.

* tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux: (53 commits)
  lib/crypto: mldsa: Clarify the documentation for mldsa_verify() slightly
  lib/crypto: aes: Drop 'volatile' from aes_sbox and aes_inv_sbox
  lib/crypto: aes: Remove old AES en/decryption functions
  lib/crypto: aesgcm: Use new AES library API
  lib/crypto: aescfb: Use new AES library API
  crypto: omap - Use new AES library API
  crypto: inside-secure - Use new AES library API
  crypto: drbg - Use new AES library API
  crypto: crypto4xx - Use new AES library API
  crypto: chelsio - Use new AES library API
  crypto: ccp - Use new AES library API
  crypto: x86/aes-gcm - Use new AES library API
  crypto: arm64/ghash - Use new AES library API
  crypto: arm/ghash - Use new AES library API
  staging: rtl8723bs: core: Use new AES library API
  net: phy: mscc: macsec: Use new AES library API
  chelsio: Use new AES library API
  Bluetooth: SMP: Use new AES library API
  crypto: x86/aes - Remove the superseded AES-NI crypto_cipher
  lib/crypto: x86/aes: Add AES-NI optimization
  ...
 2026-02-10 08:31:09 -08:00
Linus Torvalds
72c395024d A slightly calmer cycle for docs this time around, though there is still a 
fair amount going on, including:
 
 - Some signs of life on the long-moribund Japanese translation
 
 - Documentation on policies around the use of generative tools for patch
   submissions, and a separate document intended for consumption by
   generative tools.
 
 - The completion of the move of the documentation tools to tools/docs.  For
   now we're leaving a /scripts/kernel-doc symlink behind to avoid breaking
   scripts.
 
 - Ongoing build-system work includes the incorporation of documentation in
   Python code, better support for documenting variables, and lots of
   improvements and fixes.
 
 - Automatic linking of man-page references -- cat(1), for example -- to
   the online pages in the HTML build.
 
 ...and the usual array of typo fixes and such.
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Merge tag 'docs-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux

Pull documentation updates from Jonathan Corbet:
 "A slightly calmer cycle for docs this time around, though there is
  still a fair amount going on, including:

   - Some signs of life on the long-moribund Japanese translation

   - Documentation on policies around the use of generative tools for
     patch submissions, and a separate document intended for consumption
     by generative tools

   - The completion of the move of the documentation tools to
     tools/docs. For now we're leaving a /scripts/kernel-doc symlink
     behind to avoid breaking scripts

   - Ongoing build-system work includes the incorporation of
     documentation in Python code, better support for documenting
     variables, and lots of improvements and fixes

   - Automatic linking of man-page references -- cat(1), for example --
     to the online pages in the HTML build

  ...and the usual array of typo fixes and such"

* tag 'docs-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: (107 commits)
  doc: development-process: add notice on testing
  tools: sphinx-build-wrapper: improve its help message
  docs: sphinx-build-wrapper: allow -v override -q
  docs: kdoc: Fix pdfdocs build for tools
  docs: ja_JP: process: translate 'Obtain a current source tree'
  docs: fix 're-use' -> 'reuse' in documentation
  docs: ioctl-number: fix a typo in ioctl-number.rst
  docs: filesystems: ensure proc pid substitutable is complete
  docs: automarkup.py: Skip common English words as C identifiers
  Documentation: use a source-read extension for the index link boilerplate
  docs: parse_features: make documentation more consistent
  docs: add parse_features module documentation
  docs: jobserver: do some documentation improvements
  docs: add jobserver module documentation
  docs: kabi: helpers: add documentation for each "enum" value
  docs: kabi: helpers: add helper for debug bits 7 and 8
  docs: kabi: system_symbols: end docstring phrases with a dot
  docs: python: abi_regex: do some improvements at documentation
  docs: python: abi_parser: do some improvements at documentation
  docs: add kabi modules documentation
  ...
 2026-02-09 20:53:18 -08:00
Linus Torvalds
26c9342bb7 struct filename series 
[mostly] sanitize struct filename hanling
 
 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-filename' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs 'struct filename' updates from Al Viro:
 "[Mostly] sanitize struct filename handling"

* tag 'pull-filename' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (68 commits)
  sysfs(2): fs_index() argument is _not_ a pathname
  alpha: switch osf_mount() to strndup_user()
  ksmbd: use CLASS(filename_kernel)
  mqueue: switch to CLASS(filename)
  user_statfs(): switch to CLASS(filename)
  statx: switch to CLASS(filename_maybe_null)
  quotactl_block(): switch to CLASS(filename)
  chroot(2): switch to CLASS(filename)
  move_mount(2): switch to CLASS(filename_maybe_null)
  namei.c: switch user pathname imports to CLASS(filename{,_flags})
  namei.c: convert getname_kernel() callers to CLASS(filename_kernel)
  do_f{chmod,chown,access}at(): use CLASS(filename_uflags)
  do_readlinkat(): switch to CLASS(filename_flags)
  do_sys_truncate(): switch to CLASS(filename)
  do_utimes_path(): switch to CLASS(filename_uflags)
  chdir(2): unspaghettify a bit...
  do_fchownat(): unspaghettify a bit...
  fspick(2): use CLASS(filename_flags)
  name_to_handle_at(): use CLASS(filename_uflags)
  vfs_open_tree(): use CLASS(filename_uflags)
  ...
 2026-02-09 16:58:28 -08:00
Linus Torvalds
3893854000 Changes since last update: 
- Support inode page cache sharing among filesystems
 
  - Formally separate optional encoded (aka compressed) inode layouts
    (and the implementations) from the EROFS core on-disk aligned plain
    format for future zero-trust security usage
 
  - Improve performance by caching the fact that an inode does not have
    a POSIX ACL
 
  - Improve LZ4 decompression error reporting
 
  - Enable LZMA by default and promote DEFLATE and Zstandard algorithms
    out of EXPERIMENTAL status
 
  - Switch to inode_set_cached_link() to cache symlink lengths
 
  - random bugfixes and minor cleanups
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Merge tag 'erofs-for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs updates from Gao Xiang:
 "In this cycle, inode page cache sharing among filesystems on the same
  machine is now supported, which is particularly useful for
  high-density hosts running tens of thousands of containers.

  In addition, we fully isolate the EROFS core on-disk format from other
  optional encoded layouts since the core on-disk part is designed to be
  simple, effective, and secure. Users can use the core format to build
  unique golden immutable images and import their filesystem trees
  directly from raw block devices via DMA, page-mapped DAX devices,
  and/or file-backed mounts without having to worry about unnecessary
  intrinsic consistency issues found in other generic filesystems by
  design. However, the full vision is still working in progress and will
  spend more time to achieve final goals.

  There are other improvements and bug fixes as usual, as listed below:

   - Support inode page cache sharing among filesystems

   - Formally separate optional encoded (aka compressed) inode layouts
     (and the implementations) from the EROFS core on-disk aligned plain
     format for future zero-trust security usage

   - Improve performance by caching the fact that an inode does not have
     a POSIX ACL

   - Improve LZ4 decompression error reporting

   - Enable LZMA by default and promote DEFLATE and Zstandard algorithms
     out of EXPERIMENTAL status

   - Switch to inode_set_cached_link() to cache symlink lengths

   - random bugfixes and minor cleanups"

* tag 'erofs-for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: (31 commits)
  erofs: fix UAF issue for file-backed mounts w/ directio option
  erofs: update compression algorithm status
  erofs: fix inline data read failure for ztailpacking pclusters
  erofs: avoid some unnecessary #ifdefs
  erofs: handle end of filesystem properly for file-backed mounts
  erofs: separate plain and compressed filesystems formally
  erofs: use inode_set_cached_link()
  erofs: mark inodes without acls in erofs_read_inode()
  erofs: implement .fadvise for page cache share
  erofs: support compressed inodes for page cache share
  erofs: support unencoded inodes for page cache share
  erofs: pass inode to trace_erofs_read_folio
  erofs: introduce the page cache share feature
  erofs: using domain_id in the safer way
  erofs: add erofs_inode_set_aops helper to set the aops
  erofs: support user-defined fingerprint name
  erofs: decouple `struct erofs_anon_fs_type`
  fs: Export alloc_empty_backing_file
  erofs: tidy up erofs_init_inode_xattrs()
  erofs: add missing documentation about `directio` mount option
  ...
 2026-02-09 16:08:40 -08:00
Linus Torvalds
9e355113f0 vfs-7.0-rc1.misc 
Please consider pulling these changes from the signed vfs-7.0-rc1.misc tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "This contains a mix of VFS cleanups, performance improvements, API
  fixes, documentation, and a deprecation notice.

  Scalability and performance:

   - Rework pid allocation to only take pidmap_lock once instead of
     twice during alloc_pid(), improving thread creation/teardown
     throughput by 10-16% depending on false-sharing luck. Pad the
     namespace refcount to reduce false-sharing

   - Track file lock presence via a flag in ->i_opflags instead of
     reading ->i_flctx, avoiding false-sharing with ->i_readcount on
     open/close hot paths. Measured 4-16% improvement on 24-core
     open-in-a-loop benchmarks

   - Use a consume fence in locks_inode_context() to match the
     store-release/load-consume idiom, eliminating a hardware fence on
     some architectures

   - Annotate cdev_lock with __cacheline_aligned_in_smp to prevent
     false-sharing

   - Remove a redundant DCACHE_MANAGED_DENTRY check in
     __follow_mount_rcu() that never fires since the caller already
     verifies it, eliminating a 100% mispredicted branch

   - Fix a 100% mispredicted likely() in devcgroup_inode_permission()
     that became wrong after a prior code reorder

  Bug fixes and correctness:

   - Make insert_inode_locked() wait for inode destruction instead of
     skipping, fixing a corner case where two matching inodes could
     exist in the hash

   - Move f_mode initialization before file_ref_init() in alloc_file()
     to respect the SLAB_TYPESAFE_BY_RCU ordering contract

   - Add a WARN_ON_ONCE guard in try_to_free_buffers() for folios with
     no buffers attached, preventing a null pointer dereference when
     AS_RELEASE_ALWAYS is set but no release_folio op exists

   - Fix select restart_block to store end_time as timespec64, avoiding
     truncation of tv_sec on 32-bit architectures

   - Make dump_inode() use get_kernel_nofault() to safely access inode
     and superblock fields, matching the dump_mapping() pattern

  API modernization:

   - Make posix_acl_to_xattr() allocate the buffer internally since
     every single caller was doing it anyway. Reduces boilerplate and
     unnecessary error checking across ~15 filesystems

   - Replace deprecated simple_strtoul() with kstrtoul() for the
     ihash_entries, dhash_entries, mhash_entries, and mphash_entries
     boot parameters, adding proper error handling

   - Convert chardev code to use guard(mutex) and __free(kfree) cleanup
     patterns

   - Replace min_t() with min() or umin() in VFS code to avoid silently
     truncating unsigned long to unsigned int

   - Gate LOOKUP_RCU assertions behind CONFIG_DEBUG_VFS since callers
     already check the flag

  Deprecation:

   - Begin deprecating legacy BSD process accounting (acct(2)). The
     interface has numerous footguns and better alternatives exist
     (eBPF)

  Documentation:

   - Fix and complete kernel-doc for struct export_operations, removing
     duplicated documentation between ReST and source

   - Fix kernel-doc warnings for __start_dirop() and ilookup5_nowait()

  Testing:

   - Add a kunit test for initramfs cpio handling of entries with
     filesize > PATH_MAX

  Misc:

   - Add missing <linux/init_task.h> include in fs_struct.c"

* tag 'vfs-7.0-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (28 commits)
  posix_acl: make posix_acl_to_xattr() alloc the buffer
  fs: make insert_inode_locked() wait for inode destruction
  initramfs_test: kunit test for cpio.filesize > PATH_MAX
  fs: improve dump_inode() to safely access inode fields
  fs: add <linux/init_task.h> for 'init_fs'
  docs: exportfs: Use source code struct documentation
  fs: move initializing f_mode before file_ref_init()
  exportfs: Complete kernel-doc for struct export_operations
  exportfs: Mark struct export_operations functions at kernel-doc
  exportfs: Fix kernel-doc output for get_name()
  acct(2): begin the deprecation of legacy BSD process accounting
  device_cgroup: remove branch hint after code refactor
  VFS: fix __start_dirop() kernel-doc warnings
  fs: Describe @isnew parameter in ilookup5_nowait()
  fs/namei: Remove redundant DCACHE_MANAGED_DENTRY check in __follow_mount_rcu
  fs: only assert on LOOKUP_RCU when built with CONFIG_DEBUG_VFS
  select: store end_time as timespec64 in restart block
  chardev: Switch to guard(mutex) and __free(kfree)
  namespace: Replace simple_strtoul with kstrtoul to parse boot params
  dcache: Replace simple_strtoul with kstrtoul in set_dhash_entries
  ...
 2026-02-09 15:13:05 -08:00
Linus Torvalds
157d3d6efd vfs-7.0-rc1.namespace 
Please consider pulling these changes from the signed vfs-7.0-rc1.namespace tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs mount updates from Christian Brauner:

 - statmount: accept fd as a parameter

   Extend struct mnt_id_req with a file descriptor field and a new
   STATMOUNT_BY_FD flag. When set, statmount() returns mount information
   for the mount the fd resides on — including detached mounts
   (unmounted via umount2(MNT_DETACH)).

   For detached mounts the STATMOUNT_MNT_POINT and STATMOUNT_MNT_NS_ID
   mask bits are cleared since neither is meaningful. The capability
   check is skipped for STATMOUNT_BY_FD since holding an fd already
   implies prior access to the mount and equivalent information is
   available through fstatfs() and /proc/pid/mountinfo without
   privilege. Includes comprehensive selftests covering both attached
   and detached mount cases.

 - fs: Remove internal old mount API code (1 patch)

   Now that every in-tree filesystem has been converted to the new
   mount API, remove all the legacy shim code in fs_context.c that
   handled unconverted filesystems. This deletes ~280 lines including
   legacy_init_fs_context(), the legacy_fs_context struct, and
   associated wrappers. The mount(2) syscall path for userspace remains
   untouched. Documentation references to the legacy callbacks are
   cleaned up.

 - mount: add OPEN_TREE_NAMESPACE to open_tree()

   Container runtimes currently use CLONE_NEWNS to copy the caller's
   entire mount namespace — only to then pivot_root() and recursively
   unmount everything they just copied. With large mount tables and
   thousands of parallel container launches this creates significant
   contention on the namespace semaphore.

   OPEN_TREE_NAMESPACE copies only the specified mount tree (like
   OPEN_TREE_CLONE) but returns a mount namespace fd instead of a
   detached mount fd. The new namespace contains the copied tree mounted
   on top of a clone of the real rootfs.

   This functions as a combined unshare(CLONE_NEWNS) + pivot_root() in a
   single syscall. Works with user namespaces: an unshare(CLONE_NEWUSER)
   followed by OPEN_TREE_NAMESPACE creates a mount namespace owned by
   the new user namespace. Mount namespace file mounts are excluded from
   the copy to prevent cycles. Includes ~1000 lines of selftests"

* tag 'vfs-7.0-rc1.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  selftests/open_tree: add OPEN_TREE_NAMESPACE tests
  mount: add OPEN_TREE_NAMESPACE
  fs: Remove internal old mount API code
  selftests: statmount: tests for STATMOUNT_BY_FD
  statmount: accept fd as a parameter
  statmount: permission check should return EPERM
 2026-02-09 14:43:47 -08:00
Linus Torvalds
c84bb79f70 vfs-7.0-rc1.nullfs 
Please consider pulling these changes from the signed vfs-7.0-rc1.nullfs tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.nullfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs nullfs update from Christian Brauner:
 "Add a completely catatonic minimal pseudo filesystem called "nullfs"
  and make pivot_root() work in the initramfs.

  Currently pivot_root() does not work on the real rootfs because it
  cannot be unmounted. Userspace has to recursively delete initramfs
  contents manually before continuing boot, using the fragile
  switch_root sequence (overmount + chroot).

  Add nullfs, a minimal immutable filesystem that serves as the true
  root of the mount hierarchy. The mutable rootfs (tmpfs/ramfs) is
  mounted on top of it. This allows userspace to simply:

      chdir(new_root);
      pivot_root(".", ".");
      umount2(".", MNT_DETACH);

  without the traditional switch_root workarounds. systemd already
  handles this correctly. It tries pivot_root() first and falls back
  to MS_MOVE only when that fails.

  This also means rootfs mounts in unprivileged namespaces no longer
  need MNT_LOCKED, since the immutable nullfs guarantees nothing can be
  revealed by unmounting the covering mount.

  nullfs is a single-instance filesystem (get_tree_single()) marked
  SB_NOUSER | SB_I_NOEXEC | SB_I_NODEV with an immutable empty root
  directory. This means sooner or later it can be used to overmount
  other directories to hide their contents without any additional
  protection needed.

  We enable it unconditionally. If we see any real regression we'll
  hide it behind a boot option.

  nullfs has extensions beyond this in the future. It will serve as a
  concept to support the creation of completely empty mount namespaces -
  which is work coming up in the next cycle"

* tag 'vfs-7.0-rc1.nullfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  fs: use nullfs unconditionally as the real rootfs
  docs: mention nullfs
  fs: add immutable rootfs
  fs: add init_pivot_root()
  fs: ensure that internal tmpfs mount gets mount id zero
 2026-02-09 13:41:34 -08:00
Linus Torvalds
aa2a0fcd4c vfs-7.0-rc1.leases 
Please consider pulling these changes from the signed vfs-7.0-rc1.leases tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.leases' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs lease updates from Christian Brauner:
 "This contains updates for lease support to require filesystems to
  explicitly opt-in to lease support

  Currently kernel_setlease() falls through to generic_setlease() when a
  a filesystem does not define ->setlease(), silently granting lease
  support to every filesystem regardless of whether it is prepared for
  it.

  This is a poor default: most filesystems never intended to support
  leases, and the silent fallthrough makes it impossible to distinguish
  "supports leases" from "never thought about it".

  This inverts the default. It adds explicit

	.setlease = generic_setlease;

  assignments to every in-tree filesystem that should retain lease
  support, then changes kernel_setlease() to return -EINVAL when
  ->setlease is NULL.

  With the new default in place, simple_nosetlease() is redundant and
  is removed along with all references to it"

* tag 'vfs-7.0-rc1.leases' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (25 commits)
  fuse: add setlease file operation
  fs: remove simple_nosetlease()
  filelock: default to returning -EINVAL when ->setlease operation is NULL
  xfs: add setlease file operation
  ufs: add setlease file operation
  udf: add setlease file operation
  tmpfs: add setlease file operation
  squashfs: add setlease file operation
  overlayfs: add setlease file operation
  orangefs: add setlease file operation
  ocfs2: add setlease file operation
  ntfs3: add setlease file operation
  nilfs2: add setlease file operation
  jfs: add setlease file operation
  jffs2: add setlease file operation
  gfs2: add a setlease file operation
  fat: add setlease file operation
  f2fs: add setlease file operation
  exfat: add setlease file operation
  ext4: add setlease file operation
  ...
 2026-02-09 11:59:07 -08:00
Linus Torvalds
74554251df vfs-7.0-rc1.nonblocking_timestamps 
Please consider pulling these changes from the signed vfs-7.0-rc1.nonblocking_timestamps tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.nonblocking_timestamps' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs timestamp updates from Christian Brauner:
 "This contains the changes to support non-blocking timestamp updates.

  Since commit 66fa3cedf1 ("fs: Add async write file modification
  handling") file_update_time_flags() unconditionally returns -EAGAIN
  when any timestamp needs updating and IOCB_NOWAIT is set. This makes
  non-blocking direct writes impossible on file systems with granular
  enough timestamps, which in practice means all of them.

  This reworks the timestamp update path to propagate IOCB_NOWAIT
  through ->update_time so that file systems which can update timestamps
  without blocking are no longer penalized.

  With that groundwork in place, the core change passes IOCB_NOWAIT into
  ->update_time and returns -EAGAIN only when the file system indicates
  it would block.

  XFS implements non-blocking timestamp updates by using the new
  ->sync_lazytime and open-coding generic_update_time without the
  S_NOWAIT check, since the lazytime path through the generic helpers
  can never block in XFS"

* tag 'vfs-7.0-rc1.nonblocking_timestamps' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  xfs: enable non-blocking timestamp updates
  xfs: implement ->sync_lazytime
  fs: refactor file_update_time_flags
  fs: add support for non-blocking timestamp updates
  fs: add a ->sync_lazytime method
  fs: factor out a sync_lazytime helper
  fs: refactor ->update_time handling
  fat: cleanup the flags for fat_truncate_time
  nfs: split nfs_update_timestamps
  fs: allow error returns from generic_update_time
  fs: remove inode_update_time
 2026-02-09 11:25:01 -08:00
Amir Goldstein
869056dbbd ovl: relax requirement for uuid=off,index=on 
uuid=off,index=on required that all upper/lower directories are on the
same filesystem.

Relax the requirement so that only all the lower directories need to be
on the same filesystem.

Reported-by: André Almeida <andrealmeid@igalia.com>
Link: https://lore.kernel.org/r/20260114-tonyk-get_disk_uuid-v1-3-e6a319e25d57@igalia.com/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
 2026-02-06 13:48:23 +01:00