futex: Remove support for IMMUTABLE

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The FH_FLAG_IMMUTABLE flag was meant to avoid the reference counting on
the private hash and so to avoid the performance regression on big
machines.
With the switch to per-CPU counter this is no longer needed. That flag
was never useable on any released kernel.

Remove any support for IMMUTABLE while preserve the flags argument and
enforce it to be zero.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250710110011.384614-5-bigeasy@linutronix.de

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Sebastian Andrzej Siewior 2025-07-10 13:00:09 +02:00 • committed by Peter Zijlstra

parent fb3c553da7

commit 760e6f7bef

2 changed files with 3 additions and 35 deletions

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2

include/uapi/linux/prctl.h

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36

kernel/futex/core.c

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