tree bba0310f23fb911106e04d75eebe1c6ee7e8d423
parent 2550326ac7a062fdfc204f9a3b98bdb9179638fc
author Johannes Weiner <hannes@cmpxchg.org> 1295563471 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1295571726 -0800

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>