From d324236b3333e87c8825b35f2104184734020d35 Mon Sep 17 00:00:00 2001
From: Wu Fengguang <fengguang.wu@intel.com>
Date: Wed, 16 Dec 2009 12:19:59 +0100
Subject: memcg: add accessor to mem_cgroup.css

So that an outside user can free the reference count grabbed by
try_get_mem_cgroup_from_page().

CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Hugh Dickins <hugh.dickins@tiscali.co.uk>
CC: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
CC: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 mm/memcontrol.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'mm/memcontrol.c')

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b5ac61ce7346..9eee80d6d490 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -282,6 +282,11 @@ mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
 	return &mem->info.nodeinfo[nid]->zoneinfo[zid];
 }
 
+struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
+{
+	return &mem->css;
+}
+
 static struct mem_cgroup_per_zone *
 page_cgroup_zoneinfo(struct page_cgroup *pc)
 {
-- 
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