futex: Sanitize exit state handling
Instead of having a smp_mb() and an empty lock/unlock of task::pi_lock move the state setting into to the lock section. 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/20191106224556.645603214@linutronix.de
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