From b47f77b5a2243768d5cb1f143ce5e6c28baa271a Mon Sep 17 00:00:00 2001
From: Li Zefan <lizefan@huawei.com>
Date: Mon, 23 Sep 2013 16:55:43 +0800
Subject: [PATCH] memcg: convert to use cgroup_is_descendant()

This is a preparation to kill css_id.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Reading git-format-patch failed