tree af4021f97c49c59784dbab62fb1dad36fe6d6f3c
parent 3dd1f784ed6603d7ab1043e51e6371235edf2313
author Davidlohr Bueso <davidlohr.bueso@hp.com> 1373324478 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1373391207 -0700

ipc,msg: shorten critical region in msgrcv

do_msgrcv() is the last msg queue function that abuses the ipc lock Take
it only when needed when actually updating msq.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>