tree 16943d2674537a5d13a14794763a3df7e51411ab
parent 3b1c4ad37741e53804ffe0a30dd01e08b2ab6241
author Davidlohr Bueso <davidlohr.bueso@hp.com> 1378934778 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1378940379 -0700

ipc,shm: introduce shmctl_nolock

Similar to semctl and msgctl, when calling msgctl, the *_INFO and *_STAT
commands can be performed without acquiring the ipc object.

Add a shmctl_nolock() function and move the logic of *_INFO and *_STAT out
of msgctl().  Since we are just moving functionality, this change still
takes the lock and it will be properly lockless in the next patch.

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>