From: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Date: Thu, 30 Apr 2009 22:08:11 +0000 (-0700)
Subject: memcg: fix try_get_mem_cgroup_from_swapcache()
X-Git-Tag: v2.6.30-rc5~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0bd3f63ce01a1757dbce6373122a05fbf99ced7;p=pandora-kernel.git

memcg: fix try_get_mem_cgroup_from_swapcache()

This is a bugfix for commit 3c776e64660028236313f0e54f3a9945764422df
("memcg: charge swapcache to proper memcg").

Used bit of swapcache is solid under page lock, but considering
move_account, pc->mem_cgroup is not.

We need lock_page_cgroup() anyway.

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

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