From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 4 May 2013 17:13:40 +0000 (-0700)
Subject: ipc: move the rcu_read_lock() from sem_lock_and_putref() into callers
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~38^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4091fd942e96af5a0b1dfa6aac5f44153ebf7cdb;p=pandora-kernel.git

ipc: move the rcu_read_lock() from sem_lock_and_putref() into callers

This is another ipc semaphore locking cleanup, trying to make the
locking more straightforward.  We move the rcu read locking into the
callers of sem_lock_and_putref(), which in general means that we now
mostly do the rcu_read_lock() and rcu_read_unlock() in the same
function.

Mostly.  We still have the ipc_addid/newary/freeary mess, and things
like ipcctl_pre_down_nolock().

Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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