Changes in try_cmpxchg

c17ee635fd3a482b2ad2bf5e269755c2eae5f25e - Merge drm/drm-fixes into drm-misc-fixes

Mon, 23 Feb 2026 10:09:45 +0100

Merge drm/drm-fixes into drm-misc-fixes7.0-rc1 was just released, let's merge it to kick the new release cycle.Signed-off-by: Maxime Ripard List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

0923fd0419a1a2c8846e15deacac11b619e996d9 - Merge tag 'locking-core-2026-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 10 Feb 2026 21:28:44 +0100

Merge tag 'locking-core-2026-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull locking updates from Ingo Molnar: "Lock debugging: - Implement compiler-driven static analysis locking context checking, using the upcoming Clang 22 compiler's context analysis features (Marco Elver) We removed Sparse context analysis support, because prior to removal even a defconfig kernel produced 1,700+ context tracking Sparse warnings, the overwhelming majority of which are false positives. On an allmodconfig kernel the number of false positive context tracking Sparse warnings grows to over 5,200... On the plus side of the balance actual locking bugs found by Sparse context analysis is also rather ... sparse: I found only 3 such commits in the last 3 years. So the rate of false positives and the maintenance overhead is rather high and there appears to be no active policy in place to achieve a zero-warnings baseline to move the annotations & fixers to developers who introduce new code. Clang context analysis is more complete and more aggressive in trying to find bugs, at least in principle. Plus it has a different model to enabling it: it's enabled subsystem by subsystem, which results in zero warnings on all relevant kernel builds (as far as our testing managed to cover it). Which allowed us to enable it by default, similar to other compiler warnings, with the expectation that there are no warnings going forward. This enforces a zero-warnings baseline on clang-22+ builds (Which are still limited in distribution, admittedly) Hopefully the Clang approach can lead to a more maintainable zero-warnings status quo and policy, with more and more subsystems and drivers enabling the feature. Context tracking can be enabled for all kernel code via WARN_CONTEXT_ANALYSIS_ALL=y (default disabled), but this will generate a lot of false positives. ( Having said that, Sparse support could still be added back, if anyone is interested - the removal patch is still relatively straightforward to revert at this stage. ) Rust integration updates: (Alice Ryhl, Fujita Tomonori, Boqun Feng) - Add support for Atomic and replace most Rust native AtomicBool usages with Atomic - Clean up LockClassKey and improve its documentation - Add missing Send and Sync trait implementation for SetOnce - Make ARef Unpin as it is supposed to be - Add __rust_helper to a few Rust helpers as a preparation for helper LTO - Inline various lock related functions to avoid additional function calls WW mutexes: - Extend ww_mutex tests and other test-ww_mutex updates (John Stultz) Misc fixes and cleanups: - rcu: Mark lockdep_assert_rcu_helper() __always_inline (Arnd Bergmann) - locking/local_lock: Include more missing headers (Peter Zijlstra) - seqlock: fix scoped_seqlock_read kernel-doc (Randy Dunlap) - rust: sync: Replace `kernel::c_str!` with C-Strings (Tamir Duberstein)"* tag 'locking-core-2026-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (90 commits) locking/rwlock: Fix write_trylock_irqsave() with CONFIG_INLINE_WRITE_TRYLOCK rcu: Mark lockdep_assert_rcu_helper() __always_inline compiler-context-analysis: Remove __assume_ctx_lock from initializers tomoyo: Use scoped init guard crypto: Use scoped init guard kcov: Use scoped init guard compiler-context-analysis: Introduce scoped init guards cleanup: Make __DEFINE_LOCK_GUARD handle commas in initializers seqlock: fix scoped_seqlock_read kernel-doc tools: Update context analysis macros in compiler_types.h rust: sync: Replace `kernel::c_str!` with C-Strings rust: sync: Inline various lock related methods rust: helpers: Move #define __rust_helper out of atomic.c rust: wait: Add __rust_helper to helpers rust: time: Add __rust_helper to helpers rust: task: Add __rust_helper to helpers rust: sync: Add __rust_helper to helpers rust: refcount: Add __rust_helper to helpers rust: rcu: Add __rust_helper to helpers rust: processor: Add __rust_helper to helpers ... List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

0e2036a06dcf61dbd100168830287d6c42cd61e1 - scripts/atomic: Fix kerneldoc spelling in try_cmpxchg()

Tue, 06 Jan 2026 05:01:58 +0100

scripts/atomic: Fix kerneldoc spelling in try_cmpxchg()Fix a typo in the kerneldoc comment template.This changes 'occured' to 'occurred' in generated documentation.Signed-off-by: oldzhu Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260106040158.31461-1-oldrunner999@gmail.com List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

a23e1966932464e1c5226cb9ac4ce1d5fc10ba22 - Merge branch 'next' into for-linus

Mon, 15 Jul 2024 23:03:44 +0200

Merge branch 'next' into for-linusPrepare input updates for 6.11 merge window. List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

6f47c7ae8c7afaf9ad291d39f0d3974f191a7946 - Merge tag 'v6.9' into next

Tue, 28 May 2024 06:37:18 +0200

Merge tag 'v6.9' into nextSync up with the mainline to bring in the new cleanup API. List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

60a2f25de7b8b785baee2932db932ae9a5b8c86d - Merge drm/drm-next into drm-intel-gt-next

Thu, 16 May 2024 09:33:01 +0200

Merge drm/drm-next into drm-intel-gt-nextSome display refactoring patches are needed in order to allow conflict-less merging.Signed-off-by: Tvrtko Ursulin List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

594ce0b8a998aa4d05827cd7c0d0dcec9a1e3ae2 - Merge topic branches 'clkdev' and 'fixes' into for-linus

Mon, 10 Jun 2024 13:03:21 +0200

Merge topic branches 'clkdev' and 'fixes' into for-linus List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

b228ab57e51b62663a80ca820c87ba2650583f08 - Merge branch 'master' into mm-stable

Mon, 18 Mar 2024 17:55:12 +0100

Merge branch 'master' into mm-stable List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

79790b6818e96c58fe2bffee1b418c16e64e7b80 - Merge drm/drm-next into drm-xe-next

Fri, 12 Apr 2024 15:14:25 +0200

Merge drm/drm-next into drm-xe-nextBackmerging drm-next in order to get up-to-date and in particularto access commit 9ca5facd0400f610f3f7f71aeb7fc0b949a48c67.Signed-off-by: Thomas Hellström List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

3e5a516f3bf1a33f2bf219f570e9b5c031616f6a - Merge tag 'phy_dp_modes_6.10' into msm-next-lumag

Mon, 08 Apr 2024 17:35:51 +0200

Merge tag 'phy_dp_modes_6.10' into msm-next-lumagMerge DisplayPort subnode API in order to allow DisplayPort driver toconfigure the PHYs either to the DP or eDP mode, depending on hardwareconfiguration.Signed-off-by: Dmitry Baryshkov List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

5add703f6acad1c63f8a532b6de56e50d548e904 - Merge drm/drm-next into drm-intel-next

Tue, 02 Apr 2024 14:17:13 +0200

Merge drm/drm-next into drm-intel-nextCatching up on 6.9-rc2Signed-off-by: Rodrigo Vivi List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

0d21364c6e8dc1f62c34bbc49d49935c8b01844c - Merge drm/drm-next into drm-misc-next

Tue, 02 Apr 2024 09:51:30 +0200

Merge drm/drm-next into drm-misc-nextBackmerging to get v6.9-rc2 changes into drm-misc-next.Signed-off-by: Thomas Zimmermann List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

b7e1e969c887c897947fdc3754fe9b0c24acb155 - Merge branch 'topic/sound-devel-6.10' into for-next

Tue, 26 Mar 2024 12:19:11 +0100

Merge branch 'topic/sound-devel-6.10' into for-next List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

100c85421b52e41269ada88f7d71a6b8a06c7a11 - Merge tag 'asoc-fix-v6.9-rc2' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

Fri, 05 Apr 2024 08:48:12 +0200

Merge tag 'asoc-fix-v6.9-rc2' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linusASoC: Fixes for v6.9A relatively large set of fixes here, the biggest piece of it is aseries correcting some problems with the delay reporting for Intel SOFcards but there's a bunch of other things. Everything here is driverspecific except for a fix in the core for an issue with sign extensionhandling volume controls. List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

36a1818f5a1e50b805317ba13f827067d50f6970 - Merge drm/drm-fixes into drm-misc-fixes

Mon, 25 Mar 2024 21:11:58 +0100

Merge drm/drm-fixes into drm-misc-fixesBackmerging to get drm-misc-fixes to the state of v6.9-rc1.Signed-off-by: Thomas Zimmermann List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

2e2bc42c8381d2c0e9604b59e49264821da29368 - Merge branch 'linus' into x86/boot, to resolve conflict

Tue, 12 Mar 2024 09:49:52 +0100

Merge branch 'linus' into x86/boot, to resolve conflictThere's a new conflict with Linus's upstream tree, becausein the following merge conflict resolution in : 38b334fc767e Merge tag 'x86_sev_for_v6.9_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus has resolved the conflicting placement of 'cc_mask' betterthan the original commit: 1c811d403afd x86/sev: Fix position dependent variable references in startup code... which was also done by an internal merge resolution: 2e5fc4786b7a Merge branch 'x86/sev' into x86/boot, to resolve conflicts and to pick up dependent treeBut Linus is right in 38b334fc767e, the 'cc_mask' declaration is sufficientwithin the #ifdef CONFIG_ARCH_HAS_CC_PLATFORM block.So instead of forcing Linus to do the same resolution again, merge in Linus'stree and follow his conflict resolution. Conflicts: arch/x86/include/asm/coco.hSigned-off-by: Ingo Molnar List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

a5b1a017cb76e4898dd62fcb97e8aee6a63b33b5 - Merge tag 'locking-core-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 12 Mar 2024 02:33:03 +0100

Merge tag 'locking-core-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull locking updates from Ingo Molnar: - Micro-optimize local_xchg() and the rtmutex code on x86 - Fix percpu-rwsem contention tracepoints - Simplify debugging Kconfig dependencies - Update/clarify the documentation of atomic primitives - Misc cleanups* tag 'locking-core-2024-03-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/rtmutex: Use try_cmpxchg_relaxed() in mark_rt_mutex_waiters() locking/x86: Implement local_xchg() using CMPXCHG without the LOCK prefix locking/percpu-rwsem: Trigger contention tracepoints only if contended locking/rwsem: Make DEBUG_RWSEMS and PREEMPT_RT mutually exclusive locking/rwsem: Clarify that RWSEM_READER_OWNED is just a hint locking/mutex: Simplify locking/qspinlock: Fix 'wait_early' set but not used warning locking/atomic: scripts: Clarify ordering of conditional atomics List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

6dfee110c6cc7a6c3c1f45a07428c15820b87c1d - locking/atomic: scripts: Clarify ordering of conditional atomics

Fri, 09 Feb 2024 13:40:10 +0100

locking/atomic: scripts: Clarify ordering of conditional atomicsConditional atomic operations (e.g. cmpxchg()) only provide orderingwhen the condition holds; when the condition does not hold, the locationis not modified and relaxed ordering is provided. Where ordering isneeded for failed conditional atomics, it is necessary to usesmp_mb__before_atomic() and/or smp_mb__after_atomic().This is explained tersely in memory-barriers.txt, and is implied but notexplicitly stated in the kerneldoc comments for the conditionaloperations. The lack of an explicit statement has lead to some off-listqueries about the ordering semantics of failing conditional operations,so evidently this is confusing.Update the kerneldoc comments to explicitly describe the lack of orderingfor failed conditional atomic operations.For most conditional atomic operations, this is written as: | If (${condition}), atomically updates @v to (${new}) with ${desc_order} ordering. | Otherwise, @v is not modified and relaxed ordering is provided.For the try_cmpxchg() operations, this is written as: | If (${condition}), atomically updates @v to @new with ${desc_order} ordering. | Otherwise, @v is not modified, @old is updated to the current value of @v, | and relaxed ordering is provided.Signed-off-by: Mark Rutland Signed-off-by: Ingo Molnar Reviewed-by: Paul E. McKenney Reviewed-by: Nhat Pham Link: https://lore.kernel.org/r/20240209124010.2096198-1-mark.rutland@arm.com List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

cdd5b5a9761fd66d17586e4f4ba6588c70e640ea - Merge branch 'next' into for-linus

Tue, 07 Nov 2023 00:42:08 +0100

Merge branch 'next' into for-linusPrepare input updates for 6.7 merge window. List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg

34069d12e239ae8f36dd96c378e4622fb1c42a76 - Merge tag 'v6.5' into next

Tue, 05 Sep 2023 23:08:14 +0200

Merge tag 'v6.5' into nextSync up with mainline to bring in updates to the shared infrastructure. List of files: /linux/scripts/atomic/kerneldoc/try_cmpxchg