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Merge tag 'locking-futex-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull futex updates from Thomas Gleixner:

 - Switch the reference counting to a RCU based per-CPU reference to
   address a performance bottleneck vs the single instance rcuref
   variant

 - Make the futex selftest build on 32-bit architectures which only
   support 64-bit time_t, e.g. RISCV-32

 - Cleanups and improvements in selftests and futex bench

* tag 'locking-futex-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  selftests/futex: Fix spelling mistake "Succeffuly" -> "Successfully"
  selftests/futex: Define SYS_futex on 32-bit architectures with 64-bit time_t
  perf bench futex: Remove support for IMMUTABLE
  selftests/futex: Remove support for IMMUTABLE
  futex: Remove support for IMMUTABLE
  futex: Make futex_private_hash_get() static
  futex: Use RCU-based per-CPU reference counting instead of rcuref_t
  selftests/futex: Adapt the private hash test to RCU related changes
This commit is contained in:
Linus Torvalds
2025-07-29 14:39:42 -07:00
parent 02dc9d15d7 e40892214b
commit f38b1f243e
19 changed files with 326 additions and 149 deletions
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4
init/Kconfig
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@@ -1716,13 +1716,9 @@ config FUTEX_PI
depends on FUTEX && RT_MUTEXES
default y
#
# marked broken for performance reasons; gives us one more cycle to sort things out.
#
config FUTEX_PRIVATE_HASH
bool
depends on FUTEX && !BASE_SMALL && MMU
depends on BROKEN
default y
config FUTEX_MPOL