From: Johannes Weiner <hannes@cmpxchg.org>
Date: Thu, 20 Jan 2011 22:44:31 +0000 (-0800)
Subject: memcg: correctly order reading PCG_USED and pc->mem_cgroup
X-Git-Tag: v2.6.38-rc2~19^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=713735b4233fad3ae35b5cad656baa41413887ca;p=pandora-kernel.git

memcg: correctly order reading PCG_USED and pc->mem_cgroup

The placement of the read-side barrier is confused: the writer first
sets pc->mem_cgroup, then PCG_USED.  The read-side barrier has to be
between testing PCG_USED and reading pc->mem_cgroup.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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