From: Li Zefan <lizefan@huawei.com>
Date: Wed, 31 Jul 2013 01:51:31 +0000 (+0800)
Subject: cgroup: implement cgroup_from_id()
X-Git-Tag: v3.12-rc1~173^2~52
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e14880f7bb7e0dc0933af304998371dd543ceb40;p=pandora-kernel.git

cgroup: implement cgroup_from_id()

This will be used as a replacement for css_lookup().

There's a difference with cgroup id and css id. cgroup id starts with 0,
while css id starts with 1.

v4:
- also check if cggroup_mutex is held.
- make it an inline function.

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

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