tree 17ba4ec676a80cf056ecd44f4291d68c1817dee2
parent f24f22435dcc11389acc87e5586239c1819d217c
author Thomas Gleixner <tglx@linutronix.de> 1573077341 +0100
committer Thomas Gleixner <tglx@linutronix.de> 1574239209 +0100

futex: Mark the begin of futex exit explicitly

Instead of relying on PF_EXITING use an explicit state for the futex exit
and set it in the futex exit function. This moves the smp barrier and the
lock/unlock serialization into the futex code.

As with the DEAD state this is restricted to the exit path as exec
continues to use the same task struct.

This allows to simplify that logic in a next step.

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/20191106224556.539409004@linutronix.de