linux-kernel - [GIT PULL] locking updates for v6.19

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Message-ID: <aS1XcYC3mxhooU7s@gmail.com>
Date: Mon, 1 Dec 2025 09:53:05 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>, Boqun Feng <boqun.feng@...il.com>,
	Borislav Petkov <bp@...en8.de>, Uros Bizjak <ubizjak@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Gary Guo <gary@...yguo.net>, Oleg Nesterov <oleg@...hat.com>
Subject: [GIT PULL] locking updates for v6.19

Linus,

Please pull the latest locking/core Git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-core-2025-12-01

   # HEAD: 43decb6b628eb033a1b6188e5018773c0d38be1d locking/local_lock: Fix all kernel-doc warnings

   #
   # MERGE NOTE: Had to rebase the final 4 commits due to a SOB chain fail.
   #

Locking updates for v6.19:

Mutexes:

 - Redo __mutex_init() to reduce generated code size
   (Sebastian Andrzej Siewior)

Seqlocks:

 - Introduce scoped_seqlock_read() (Peter Zijlstra)

 - Change thread_group_cputime() to use scoped_seqlock_read()
   (Oleg Nesterov)

 - Change do_task_stat() to use scoped_seqlock_read()
   (Oleg Nesterov)

 - Change do_io_accounting() to use scoped_seqlock_read()
   (Oleg Nesterov)

 - Fix the incorrect documentation of read_seqbegin_or_lock() /
   need_seqretry() (Oleg Nesterov)

 - Allow KASAN to fail optimizing (Peter Zijlstra)

Local lock updates:

 - Fix all kernel-doc warnings (Randy Dunlap)

 - Add the <linux/local_lock*.h> headers to MAINTAINERS
   (Sebastian Andrzej Siewior)

 - Reduce the risk of shadowing via s/l/__l/ and s/tl/__tl/
   (Vincent Mailhol)

Lock debugging:

 - spinlock/debug: Fix data-race in do_raw_write_lock
   (Alexander Sverdlin)

Atomic primitives infrastructure:

 - atomic: Skip alignment check for try_cmpxchg() old arg
   (Arnd Bergmann)

Rust runtime integration:

 - sync: atomic: Enable generated Atomic<T> usage (Boqun Feng)

 - sync: atomic: Implement Debug for Atomic<Debug> (Boqun Feng)

 - debugfs: Remove Rust native atomics and replace them with
   Linux versions (Boqun Feng)

 - debugfs: Implement Reader for Mutex<T> only when T is Unpin
   (Boqun Feng)

 - lock: guard: Add T: Unpin bound to DerefMut (Daniel Almeida)

 - lock: Pin the inner data (Daniel Almeida)

 - lock: Add a Pin<&mut T> accessor (Daniel Almeida)

 Thanks,

	Ingo

------------------>
Alexander Sverdlin (1):
      locking/spinlock/debug: Fix data-race in do_raw_write_lock

Arnd Bergmann (1):
      atomic: Skip alignment check for try_cmpxchg() old arg

Boqun Feng (4):
      rust: debugfs: Implement Reader for Mutex<T> only when T is Unpin
      rust: sync: atomic: Make Atomic*Ops pub(crate)
      rust: sync: atomic: Implement Debug for Atomic<Debug>
      rust: debugfs: Replace the usage of Rust native atomics

Daniel Almeida (3):
      rust: lock: guard: Add T: Unpin bound to DerefMut
      rust: lock: Pin the inner data
      rust: lock: Add a Pin<&mut T> accessor

Oleg Nesterov (4):
      documentation: seqlock: fix the wrong documentation of read_seqbegin_or_lock/need_seqretry
      seqlock: Change thread_group_cputime() to use scoped_seqlock_read()
      seqlock: Change do_task_stat() to use scoped_seqlock_read()
      seqlock: Change do_io_accounting() to use scoped_seqlock_read()

Peter Zijlstra (2):
      seqlock: Introduce scoped_seqlock_read()
      seqlock: Allow KASAN to fail optimizing

Randy Dunlap (1):
      locking/local_lock: Fix all kernel-doc warnings

Sebastian Andrzej Siewior (2):
      locking/mutex: Redo __mutex_init() to reduce generated code size
      locking/local_lock: Add the <linux/local_lock*.h> headers to MAINTAINERS

Vincent Mailhol (1):
      locking/local_lock: s/l/__l/ and s/tl/__tl/ to reduce the risk of shadowing


 Documentation/locking/seqlock.rst          |   9 ++-
 MAINTAINERS                                |   1 +
 fs/proc/array.c                            |   9 +--
 fs/proc/base.c                             |  13 +---
 include/linux/atomic/atomic-instrumented.h |  26 +++----
 include/linux/local_lock.h                 |   4 +-
 include/linux/local_lock_internal.h        |  62 ++++++++--------
 include/linux/mutex.h                      |  45 +++++++++---
 include/linux/seqlock.h                    | 114 +++++++++++++++++++++++++++++
 kernel/locking/mutex-debug.c               |  10 +--
 kernel/locking/mutex.c                     |  28 +++++--
 kernel/locking/mutex.h                     |   5 +-
 kernel/locking/rtmutex_api.c               |  19 ++++-
 kernel/locking/spinlock_debug.c            |   4 +-
 kernel/sched/cputime.c                     |  20 ++---
 rust/kernel/debugfs/traits.rs              |  55 +++++---------
 rust/kernel/sync/atomic.rs                 |  12 ++-
 rust/kernel/sync/lock.rs                   |  41 ++++++++++-
 rust/kernel/sync/lock/global.rs            |   5 +-
 samples/rust/rust_debugfs.rs               |  12 ++-
 samples/rust/rust_debugfs_scoped.rs        |   6 +-
 scripts/atomic/gen-atomic-instrumented.sh  |  11 ++-
 22 files changed, 339 insertions(+), 172 deletions(-)