From: Michal Hocko <mhocko@suse.cz>
Date: Thu, 28 Mar 2013 07:48:14 +0000 (+0100)
Subject: memcg: fix memcg_cache_name() to use cgroup_name()
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~124^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9c10ddddc98db0a316243cd266c466875975a94;p=pandora-kernel.git

memcg: fix memcg_cache_name() to use cgroup_name()

As cgroup supports rename, it's unsafe to dereference dentry->d_name
without proper vfs locks. Fix this by using cgroup_name() rather than
dentry directly.

Also open code memcg_cache_name because it is called only from
kmem_cache_dup which frees the returned name right after
kmem_cache_create_memcg makes a copy of it. Such a short-lived
allocation doesn't make too much sense. So replace it by a static
buffer as kmem_cache_dup is called with memcg_cache_mutex.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

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