futex: Add mutex around futex exit

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The mutex will be used in subsequent changes to replace the busy looping of
a waiter when the futex owner is currently executing the exit cleanup to
prevent a potential live lock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20191106224556.845798895@linutronix.de

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Thomas Gleixner 2019-11-06 22:55:44 +01:00

parent af8cbda2cf

commit 3f186d9748

3 changed files with 18 additions and 0 deletions

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1

include/linux/futex.h

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include/linux/sched.h

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