tree c7f1a4b8ab31d63aa79a7e130f8a65bbebfd3269
parent 89e9e66ba1b3bde9d8ea90566c2aee20697ad681
author Davidlohr Bueso <dave@stgolabs.net> 1461208164 -0700
committer Thomas Gleixner <tglx@linutronix.de> 1461229569 +0200

futex: Acknowledge a new waiter in counter before plist

Otherwise an incoming waker on the dest hash bucket can miss
the waiter adding itself to the plist during the lockless
check optimization (small window but still the correct way
of doing this); similarly to the decrement counterpart.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: bigeasy@linutronix.de
Cc: dvhart@infradead.org
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1461208164-29150-1-git-send-email-dave@stgolabs.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>