From 2cb378c862777d050c20db903b119a029845fdcb Mon Sep 17 00:00:00 2001
From: Paul Menage <menage@google.com>
Date: Wed, 7 Jan 2009 18:08:37 -0800
Subject: [PATCH] cgroups: use hierarchy_mutex in memory controller

Update the memory controller to use its hierarchy_mutex rather than
calling cgroup_lock() to protected against cgroup_mkdir()/cgroup_rmdir()
from occurring in its hierarchy.

Signed-off-by: Paul Menage <menage@google.com>
Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.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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