From cc045e3952175e84c38dad22dea14465b9fc8fb5 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizefan@huawei.com>
Date: Fri, 14 Feb 2014 16:56:04 +0800
Subject: [PATCH] cgroup: deal with dummp_top in cgroup_name() and
 cgroup_path()

My kernel fails to boot, because blkcg calls cgroup_path() while
cgroupfs is not mounted.

Fix both cgroup_name() and cgroup_path().

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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