tree 2ff18df8c024ae92e7e8912186c34b10b4b6f4bd
parent d4212093dca95c1f52197017d969cc66d5d962aa
author Manfred Spraul <manfred@colorfullife.com> 1260924451 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1260976809 -0800

ipc/sem.c: optimize if semops fail

Reduce the amount of scanning of the list of pending semaphore operations:
If try_atomic_semop failed, then no changes were applied.  Thus no need to
restart.

Additionally, this patch correct an incorrect comment: It's possible to
wait for arbitrary semaphore values (do a dec by <x>, wait-for-zero, inc
by <x> in one atomic operation)

Both changes are from Nick Piggin, the patch is the result of a different
split of the individual changes.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Pierre Peiffer <peifferp@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>