mirror of
https://github.com/torvalds/linux.git
synced 2026-09-23 05:04:02 +02:00
18fbf5151d
Everything: Total patches: 171 Reviews/patch: 1.83 Reviewed rate: 82% Excluding selftests: Total patches: 149 Reviews/patch: 1.77 Reviewed rate: 80% Excluding selftests and maple_tree: Total patches: 129 Reviews/patch: 1.99 Reviewed rate: 89% Summary of patch series in this merge: - "mm/rmap: index MAP_PRIVATE file-backed folios by anonymous pgoff" (Lorenzo Stoakes): Index MAP_PRIVATE file-backed folios by their anonymous page offset to resolve confusion around reverse mapping for zeroed and CoW'd file-backed memory. Use this new VMA anonymous page offset tracking to eliminate index conflicts and lay the foundation for scalable CoW performance improvements. - "promote mapped executable folios after first usage for MGLRU" (Baolin Wang): Make MGLRU's protection of mapped executable file folios more reliable. Follow the classical LRU's logic, promoting mapped executable file folios after their first usage to give executable code a better chance to stay in memory and improve workload performance. - "mm: vmscan: fix node reclaim ignoring swappiness parameter" (Ridong Chen): Fix per-node proactive reclaim interface's ignoring the swappiness parameter when CONFIG_MEMCG is disabled by consolidating sc_swappiness() into a single function that checks proactive_swappiness regardless of kernel configuration. - "mm/vmscan: reduce lru_lock contention via vmstat-derived scan-balance cost" (Usama Arif): Reduce lru_lock contention in the reclaim path by deriving scan-balance costs from vmstat counters rather than lock-acquired producer updates. Read and decay these cost signals on the reclaim side under a dedicated per-lruvec lock, reducing total LRU lock wait time by over 60% without impacting scan throughput. - "zram: fix zram issues reported by sashiko" (Sergey Senozhatsky): Fix two low-risk zram bugs which Sashiko spotted in drive-by review. - "Honor XA_FLAGS_ACCOUNT in xas_split_alloc() and charge to folio's memcg" (Zi Yan): Fix xas_split_alloc() by enabling target folio memcg charging during splits and adding the missing __GFP_ACCOUNT flag for proper XArray node memory accounting. - "selftests/mm: use pattern matching in .gitignore" (Pratyush Mallick): Replace hardcoded binary names in selftests/mm/.gitignore with a generic pattern-matching rule to automatically ignore generated test files and avoid manual updates when adding new tests. - "mm/page_ext: remove pgdat_page_ext_init()" (Sang-Heon Jeon): Make the incompatibility between FLATMEM and NUMA explicit in mm/Kconfig and remove the unused pgdat_page_ext_init() function. - "zram: fix zstd error paths and add parameter validation" (Haoqin Huang): Clean up zram compression backends by removing redundant error cleanup, adding parameter and dictionary validation, auto-prefixing algorithm error logs, and resetting parameters prior to reinitialization. - "zram: fix stale scan bounds after reinitialization" (Longlong Xia): Prevent out-of-bounds slot accesses during concurrent zram resets by moving table scan bound calculations under dev_lock in writeback_store() and read_block_state(). - "add anon mTHP collapse test cases" (Baolin Wang): Extend selftests helper functions to support arbitrary page orders and add new test cases and options for mTHP collapse in khugepaged. - "selftests/mm: Handle unsupported and transient test conditions" (Muhammad Usama Anjum): Update MM selftests to report a SKIP status instead of a failure when required kernel or filesystem features are unsupported, while adding retry logic for transient page migration errors. - "mm/zswap: Fixes and improves the zswap shrink" (Hao Jia): Fix the missing zswap global shrinker when CONFIG_MEMCG is disabled and extend shrink_memcg() to support batch writeback for improved writeback efficiency. - "alloc_tag: introduce IOCTL-based filtering for MAP" (Suren Baghdasaryan): Introduce an IOCTL-based binary interface for memory allocation profiling that enables kernel-side filtering before per-CPU counter aggregation. This eliminates the text-parsing overhead of /proc/allocinfo and provides up to a 20x speedup by transferring only filtered allocation data to userspace. - "better block swap batching and a different take on swap_ops v5" (Christoph Hellwig): Refactor block swap I/O to use swap_iocb for batching instead of single-bio requests and rebase the swap_ops interface, achieving faster swap throughput during kernel builds. - "mm: kmemleak: reduce transient false positives by confirming leaks" (Catalin Marinas): Reduce false-positive kmemleak reports by combining two kmemleak enhancements that add a second confirmation scan and a configurable minimum unreferenced scan count module parameter. - "mm: kmemleak: default min_unref_scans to 2 for verbose kernels" (Breno Leitao): Auto-scanning kernels can generate false-positive memory leak reports on single scans, so this patch defaults min_unref_scans to 2 when CONFIG_DEBUG_KMEMLEAK_VERBOSE is enabled to require a second confirming scan. - "swap_ops updates" (Christoph Hellwig): Batching I/O for synchronous swap devices causes performance regressions and filesystem-based swap suffers from double-indirection overhead. This series resolves both issues by reintroducing per-folio writes for synchronous swap and allowing filesystems to directly export their own swap_ops. - "mm/khugepaged: several cleanups" (Nico Pache): khugepaged accumulated redundant state-checking patterns and outdated comments following mTHP integration. Introduce dedicated helpers for PTE validation and event counting while refreshing the internal documentation. - "maple_tree: lock checking and clean ups" (Liam Howlett): Syzbot reports incorrectly blame memory management exit paths for locking bugs, maple tree erase operations risk allocation failures without gfp flags and internal documentation lacks clarity. Improve lock error detection, update docs, fix race and allocation edge cases and optimize erase allocations using a fallback to GFP_KERNEL | GFP_NOFAIL. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCao9nJQAKCRDdBJ7gKXxA jk/9AQDlfevYJuSJmzAI8bt8ISG+/TfXMtIZC/MdbHqtQVYWPQD8Cvm3DUZsdGB/ Gloq/HBFuMPgE8p2pwUIthdgnTPNvAc= =c+Nb -----END PGP SIGNATURE----- Merge tag 'mm-stable-2026-08-26-15-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull more MM updates from Andrew Morton: - "mm/rmap: index MAP_PRIVATE file-backed folios by anonymous pgoff" (Lorenzo Stoakes) Index MAP_PRIVATE file-backed folios by their anonymous page offset to resolve confusion around reverse mapping for zeroed and CoW'd file-backed memory. Use this new VMA anonymous page offset tracking to eliminate index conflicts and lay the foundation for scalable CoW performance improvements. - "promote mapped executable folios after first usage for MGLRU" (Baolin Wang) Make MGLRU's protection of mapped executable file folios more reliable. Follow the classical LRU's logic, promoting mapped executable file folios after their first usage to give executable code a better chance to stay in memory and improve workload performance. - "mm: vmscan: fix node reclaim ignoring swappiness parameter" (Ridong Chen) Fix per-node proactive reclaim interface's ignoring the swappiness parameter when CONFIG_MEMCG is disabled by consolidating sc_swappiness() into a single function that checks proactive_swappiness regardless of kernel configuration. - "mm/vmscan: reduce lru_lock contention via vmstat-derived scan-balance cost" (Usama Arif) Reduce lru_lock contention in the reclaim path by deriving scan-balance costs from vmstat counters rather than lock-acquired producer updates. Read and decay these cost signals on the reclaim side under a dedicated per-lruvec lock, reducing total LRU lock wait time by over 60% without impacting scan throughput. - "zram: fix zram issues reported by sashiko" (Sergey Senozhatsky) Fix two low-risk zram bugs which Sashiko spotted in drive-by review. - "Honor XA_FLAGS_ACCOUNT in xas_split_alloc() and charge to folio's memcg" (Zi Yan) Fix xas_split_alloc() by enabling target folio memcg charging during splits and adding the missing __GFP_ACCOUNT flag for proper XArray node memory accounting. - "selftests/mm: use pattern matching in .gitignore" (Pratyush Mallick) Replace hardcoded binary names in selftests/mm/.gitignore with a generic pattern-matching rule to automatically ignore generated test files and avoid manual updates when adding new tests. - "mm/page_ext: remove pgdat_page_ext_init()" (Sang-Heon Jeon) Make the incompatibility between FLATMEM and NUMA explicit in mm/Kconfig and remove the unused pgdat_page_ext_init() function. - "zram: fix zstd error paths and add parameter validation" (Haoqin Huang) Clean up zram compression backends by removing redundant error cleanup, adding parameter and dictionary validation, auto-prefixing algorithm error logs, and resetting parameters prior to reinitialization. - "zram: fix stale scan bounds after reinitialization" (Longlong Xia) Prevent out-of-bounds slot accesses during concurrent zram resets by moving table scan bound calculations under dev_lock in writeback_store() and read_block_state(). - "add anon mTHP collapse test cases" (Baolin Wang) Extend selftests helper functions to support arbitrary page orders and add new test cases and options for mTHP collapse in khugepaged. - "selftests/mm: Handle unsupported and transient test conditions" (Muhammad Usama Anjum) Update MM selftests to report a SKIP status instead of a failure when required kernel or filesystem features are unsupported, while adding retry logic for transient page migration errors. - "mm/zswap: Fixes and improves the zswap shrink" (Hao Jia) Fix the missing zswap global shrinker when CONFIG_MEMCG is disabled and extend shrink_memcg() to support batch writeback for improved writeback efficiency. - "alloc_tag: introduce IOCTL-based filtering for MAP" (Suren Baghdasaryan) Introduce an IOCTL-based binary interface for memory allocation profiling that enables kernel-side filtering before per-CPU counter aggregation. This eliminates the text-parsing overhead of /proc/allocinfo and provides up to a 20x speedup by transferring only filtered allocation data to userspace. - "better block swap batching and a different take on swap_ops v5" (Christoph Hellwig) Refactor block swap I/O to use swap_iocb for batching instead of single-bio requests and rebase the swap_ops interface, achieving faster swap throughput during kernel builds. - "mm: kmemleak: reduce transient false positives by confirming leaks" (Catalin Marinas) Reduce false-positive kmemleak reports by combining two kmemleak enhancements that add a second confirmation scan and a configurable minimum unreferenced scan count module parameter. - "mm: kmemleak: default min_unref_scans to 2 for verbose kernels" (Breno Leitao) Auto-scanning kernels can generate false-positive memory leak reports on single scans, so this patch defaults min_unref_scans to 2 when CONFIG_DEBUG_KMEMLEAK_VERBOSE is enabled to require a second confirming scan. - "swap_ops updates" (Christoph Hellwig) Batching I/O for synchronous swap devices causes performance regressions and filesystem-based swap suffers from double-indirection overhead. This series resolves both issues by reintroducing per-folio writes for synchronous swap and allowing filesystems to directly export their own swap_ops. - "mm/khugepaged: several cleanups" (Nico Pache) khugepaged accumulated redundant state-checking patterns and outdated comments following mTHP integration. Introduce dedicated helpers for PTE validation and event counting while refreshing the internal documentation. - "maple_tree: lock checking and clean ups" (Liam Howlett) Syzbot reports incorrectly blame memory management exit paths for locking bugs, maple tree erase operations risk allocation failures without gfp flags and internal documentation lacks clarity. Improve lock error detection, update docs, fix race and allocation edge cases and optimize erase allocations using a fallback to GFP_KERNEL | GFP_NOFAIL. * tag 'mm-stable-2026-08-26-15-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (172 commits) selftests/proc: make proc-maps-race work with READ_IMPLIES_EXEC memcg: move LRU size accounting on reparenting instead of copying it mm/vmscan: fix comment logic in balance_pgdat maple_tree: add helper mas_make_walkable() maple_tree: avoid extra gap calculation maple_tree: fix argument name in header maple_tree: change two GFP flags in tests maple_tree: document erase and allocations better maple_tree: avoid mas_erase() and mtree_erase() failures maple_tree: document that erase may use GFP_KERNEL for allocations maple_tree: catch race in mas_alloc_cyclic() maple_tree: add bulk parent set helper maple_tree: micro optimisation of mas_wr_store_type() maple_tree: optimise mas_wr_node_store() when not in rcu mode maple_tree: use prefetched value in mas_wr_store_type() maple_tree: clarify comments on mas_nomem() maple_tree: drop MAPLE_ALLOC_SLOTS maple_tree: drop dead code from mas_extend_spanning_null() maple_tree: documentation fix maple_tree: add write lock checking with lockdep sequence numbers ...
246 lines
8.0 KiB
Plaintext
246 lines
8.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
|
|
menu "Generic Driver Options"
|
|
|
|
config AUXILIARY_BUS
|
|
bool
|
|
|
|
config UEVENT_HELPER
|
|
bool "Support for uevent helper"
|
|
help
|
|
The uevent helper program is forked by the kernel for
|
|
every uevent.
|
|
Before the switch to the netlink-based uevent source, this was
|
|
used to hook hotplug scripts into kernel device events. It
|
|
usually pointed to a shell script at /sbin/hotplug.
|
|
This should not be used today, because usual systems create
|
|
many events at bootup or device discovery in a very short time
|
|
frame. One forked process per event can create so many processes
|
|
that it creates a high system load, or on smaller systems
|
|
it is known to create out-of-memory situations during bootup.
|
|
|
|
config UEVENT_HELPER_PATH
|
|
string "path to uevent helper"
|
|
depends on UEVENT_HELPER
|
|
default ""
|
|
help
|
|
To disable user space helper program execution at by default
|
|
specify an empty string here. This setting can still be altered
|
|
via /proc/sys/kernel/hotplug or via /sys/kernel/uevent_helper
|
|
later at runtime.
|
|
|
|
config DEVTMPFS
|
|
bool "Maintain a devtmpfs filesystem to mount at /dev"
|
|
help
|
|
This creates a tmpfs/ramfs filesystem instance early at bootup.
|
|
In this filesystem, the kernel driver core maintains device
|
|
nodes with their default names and permissions for all
|
|
registered devices with an assigned major/minor number.
|
|
Userspace can modify the filesystem content as needed, add
|
|
symlinks, and apply needed permissions.
|
|
It provides a fully functional /dev directory, where usually
|
|
udev runs on top, managing permissions and adding meaningful
|
|
symlinks.
|
|
In very limited environments, it may provide a sufficient
|
|
functional /dev without any further help. It also allows simple
|
|
rescue systems, and reliably handles dynamic major/minor numbers.
|
|
|
|
Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs
|
|
file system will be used instead.
|
|
|
|
config DEVTMPFS_MOUNT
|
|
bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs"
|
|
depends on DEVTMPFS
|
|
help
|
|
This will instruct the kernel to automatically mount the
|
|
devtmpfs filesystem at /dev, directly after the kernel has
|
|
mounted the root filesystem. The behavior can be overridden
|
|
with the commandline parameter: devtmpfs.mount=0|1.
|
|
This option does not affect initramfs based booting, here
|
|
the devtmpfs filesystem always needs to be mounted manually
|
|
after the rootfs is mounted.
|
|
With this option enabled, it allows to bring up a system in
|
|
rescue mode with init=/bin/sh, even when the /dev directory
|
|
on the rootfs is completely empty.
|
|
|
|
config DEVTMPFS_SAFE
|
|
bool "Use nosuid,noexec mount options on devtmpfs"
|
|
depends on DEVTMPFS
|
|
help
|
|
This instructs the kernel to include the MS_NOEXEC and MS_NOSUID mount
|
|
flags when mounting devtmpfs.
|
|
|
|
Notice: If enabled, things like /dev/mem cannot be mmapped
|
|
with the PROT_EXEC flag. This can break, for example, non-KMS
|
|
video drivers.
|
|
|
|
config DRIVER_DEFERRED_PROBE_TIMEOUT
|
|
int "Default value for deferred_probe_timeout"
|
|
default 0 if !MODULES
|
|
default 10 if MODULES
|
|
help
|
|
Set the default value for the deferred_probe_timeout kernel parameter.
|
|
See Documentation/admin-guide/kernel-parameters.txt for a description
|
|
of the deferred_probe_timeout kernel parameter.
|
|
|
|
config STANDALONE
|
|
bool "Select only drivers that don't need compile-time external firmware"
|
|
default y
|
|
help
|
|
Select this option if you don't have magic firmware for drivers that
|
|
need it.
|
|
|
|
If unsure, say Y.
|
|
|
|
config PREVENT_FIRMWARE_BUILD
|
|
bool "Disable drivers features which enable custom firmware building"
|
|
default y
|
|
help
|
|
Say yes to disable driver features which enable building a custom
|
|
driver firmware at kernel build time. These drivers do not use the
|
|
kernel firmware API to load firmware (CONFIG_FW_LOADER), instead they
|
|
use their own custom loading mechanism. The required firmware is
|
|
usually shipped with the driver, building the driver firmware
|
|
should only be needed if you have an updated firmware source.
|
|
|
|
Firmware should not be being built as part of kernel, these days
|
|
you should always prevent this and say Y here. There are only two
|
|
old drivers which enable building of its firmware at kernel build
|
|
time:
|
|
|
|
o CONFIG_WANXL through CONFIG_WANXL_BUILD_FIRMWARE
|
|
o CONFIG_SCSI_AIC79XX through CONFIG_AIC79XX_BUILD_FIRMWARE
|
|
|
|
source "drivers/base/firmware_loader/Kconfig"
|
|
|
|
config WANT_DEV_COREDUMP
|
|
bool
|
|
help
|
|
Drivers should "select" this option if they desire to use the
|
|
device coredump mechanism.
|
|
|
|
config ALLOW_DEV_COREDUMP
|
|
bool "Allow device coredump" if EXPERT
|
|
default y
|
|
help
|
|
This option controls if the device coredump mechanism is available or
|
|
not; if disabled, the mechanism will be omitted even if drivers that
|
|
can use it are enabled.
|
|
Say 'N' for more sensitive systems or systems that don't want
|
|
to ever access the information to not have the code, nor keep any
|
|
data.
|
|
|
|
If unsure, say Y.
|
|
|
|
config DEV_COREDUMP
|
|
bool
|
|
default y if WANT_DEV_COREDUMP
|
|
depends on ALLOW_DEV_COREDUMP
|
|
|
|
config DEBUG_DRIVER
|
|
bool "Driver Core verbose debug messages"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here if you want the Driver core to produce a bunch of
|
|
debug messages to the system log. Select this if you are having a
|
|
problem with the driver core and want to see more of what is
|
|
going on.
|
|
|
|
If you are unsure about this, say N here.
|
|
|
|
config DEBUG_DEVRES
|
|
bool "Managed device resources verbose debug messages"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
This option enables kernel parameter devres.log. If set to
|
|
non-zero, devres debug messages are printed. Select this if
|
|
you are having a problem with devres or want to debug
|
|
resource management for a managed device. devres.log can be
|
|
switched on and off from sysfs node.
|
|
|
|
If you are unsure about this, Say N here.
|
|
|
|
config DEBUG_TEST_DRIVER_REMOVE
|
|
bool "Test driver remove calls during probe (UNSTABLE)"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here if you want the Driver core to test driver remove functions
|
|
by calling probe, remove, probe. This tests the remove path without
|
|
having to unbind the driver or unload the driver module.
|
|
|
|
This option is expected to find errors and may render your system
|
|
unusable. You should say N here unless you are explicitly looking to
|
|
test this functionality.
|
|
|
|
config PM_QOS_KUNIT_TEST
|
|
bool "KUnit Test for PM QoS features" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT=y
|
|
default KUNIT_ALL_TESTS
|
|
|
|
config PM_RUNTIME_KUNIT_TEST
|
|
tristate "KUnit Tests for runtime PM" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
depends on PM
|
|
default KUNIT_ALL_TESTS
|
|
|
|
config HMEM_REPORTING
|
|
bool
|
|
default n
|
|
depends on NUMA
|
|
help
|
|
Enable reporting for heterogeneous memory access attributes under
|
|
their non-uniform memory nodes.
|
|
|
|
source "drivers/base/test/Kconfig"
|
|
|
|
config SYS_HYPERVISOR
|
|
bool
|
|
default n
|
|
|
|
config GENERIC_CPU_DEVICES
|
|
bool
|
|
default n
|
|
|
|
config GENERIC_CPU_AUTOPROBE
|
|
bool
|
|
|
|
config GENERIC_CPU_VULNERABILITIES
|
|
bool
|
|
|
|
config SOC_BUS
|
|
bool
|
|
select GLOB
|
|
|
|
source "drivers/base/regmap/Kconfig"
|
|
|
|
config DMA_SHARED_BUFFER
|
|
bool
|
|
default n
|
|
select IRQ_WORK
|
|
help
|
|
This option enables the framework for buffer-sharing between
|
|
multiple drivers. A buffer is associated with a file using driver
|
|
APIs extension; the file's descriptor can then be passed on to other
|
|
driver.
|
|
|
|
config GENERIC_ARCH_TOPOLOGY
|
|
bool
|
|
help
|
|
Enable support for architectures common topology code: e.g., parsing
|
|
CPU capacity information from DT, usage of such information for
|
|
appropriate scaling, sysfs interface for reading capacity values at
|
|
runtime.
|
|
|
|
config FW_DEVLINK_SYNC_STATE_TIMEOUT
|
|
bool "sync_state() behavior defaults to timeout instead of strict"
|
|
help
|
|
This is build time equivalent of adding kernel command line parameter
|
|
"fw_devlink.sync_state=timeout". Give up waiting on consumers and
|
|
call sync_state() on any devices that haven't yet received their
|
|
sync_state() calls after deferred_probe_timeout has expired or by
|
|
late_initcall() if !CONFIG_MODULES. You should almost always want to
|
|
select N here unless you have already successfully tested with the
|
|
command line option on every system/board your kernel is expected to
|
|
work on.
|
|
|
|
endmenu
|