linux-kernel - [RFC][PATCH 0/4] locking: Add/convert context analysis bits

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Message-ID: <20260121110704.221498346@infradead.org>
Date: Wed, 21 Jan 2026 12:07:04 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: elver@...gle.com
Cc: linux-kernel@...r.kernel.org,
 bigeasy@...utronix.de,
 peterz@...radead.org,
 mingo@...nel.org,
 tglx@...utronix.de,
 will@...nel.org,
 boqun.feng@...il.com,
 longman@...hat.com,
 hch@....de,
 rostedt@...dmis.org,
 bvanassche@....org,
 llvm@...ts.linux.dev
Subject: [RFC][PATCH 0/4] locking: Add/convert context analysis bits

Hai

This is on top of tip/locking/core with these patches on:

  https://lkml.kernel.org/r/20260119094029.1344361-1-elver@google.com

and converts mutex, rtmutex, ww_mutex and futex to use the new context analysis
bits.

There is one snafu:

ww_mutex_set_context_fastpath()'s data_race() usage doesn't stop the compiler
from complaining when building a defconfig+PREEMPT_RT+LOCKDEP build:

../kernel/locking/ww_mutex.h:439:24: error: calling function '__ww_mutex_has_waiters' requires holding raw_spinlock 'lock->base.rtmutex.wait_lock' exclusively [-Werror,-Wthread-safety-analysis]
  439 |         if (likely(!data_race(__ww_mutex_has_waiters(&lock->base))))
      |                               ^
1 error generated.