tree 6b8e651239219e85a6b3b9238878c4a6eb4f2d9c
parent 56a50adda49b2020156616c4eb15353e0f9ad7de
author Eric Paris <eparis@redhat.com> 1237828929 +0100
committer Ingo Molnar <mingo@elte.hu> 1241016354 +0200

mutex: add atomic_dec_and_mutex_lock()

Much like the atomic_dec_and_lock() function in which we take an hold a
spin_lock if we drop the atomic to 0 this function takes and holds the
mutex if we dec the atomic to 0.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090323172417.410913479@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>