Davidlohr Bueso 370b262c89 ipc/sem: avoid idr tree lookup for interrupted semop ... We can avoid the idr tree lookup (albeit possibly avoiding idr_find_fast()) when being awoken in EINTR, as the semid will not change in this context while blocked. Use the sma pointer directly and take the sem_lock, then re-check for RMID races. We continue to re-check the queue.status with the lock held such that we can detect situations where we where are dealing with a spurious wakeup but another task that holds the sem_lock updated the queue.status while we were spinning for it. Once we take the lock it obviously won't change again. Being the only caller, get rid of sem_obtain_lock() altogether. Link: http://lkml.kernel.org/r/1478708774-28826-3-git-send-email-dave@stgolabs.net Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-12-14 16:04:08 -08:00
..
compat_mq.c
compat.c
ipc_sysctl.c
Makefile
mq_sysctl.c
mqueue.c	sched/wake_q: Rename WAKE_Q to DEFINE_WAKE_Q	2016-11-21 10:29:01 +01:00
msg.c	ipc: msg, make msgrcv work with LONG_MIN	2016-12-14 16:04:08 -08:00
msgutil.c	ipc: account for kmem usage on mqueue and msg	2016-10-27 18:43:43 -07:00
namespace.c	Merge branch 'nsfs-ioctls' into HEAD	2016-09-22 20:00:36 -05:00
sem.c	ipc/sem: avoid idr tree lookup for interrupted semop	2016-12-14 16:04:08 -08:00
shm.c	ipc/shm.c: coding style fixes	2016-12-14 16:04:08 -08:00
syscall.c
util.c
util.h