tree c435476a079d3bff28ec8c67377227effba57ca9
parent 68eccc1dc345539d589ae78ee43b835c1a06a134
author Davidlohr Bueso <davidlohr.bueso@hp.com> 1378934780 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1378940379 -0700

ipc,shm: make shmctl_nolock lockless

While the INFO cmd doesn't take the ipc lock, the STAT commands do acquire
it unnecessarily.  We can do the permissions and security checks only
holding the rcu lock.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>