From: Li Zefan <lizefan@huawei.com>
Date: Wed, 31 Jul 2013 01:50:50 +0000 (+0800)
Subject: cgroup: convert cgroup_ida to cgroup_idr
X-Git-Tag: v3.12-rc1~173^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e96ee8e981b5140a2bcc5fff0d5c0eef39a62ee;p=pandora-kernel.git

cgroup: convert cgroup_ida to cgroup_idr

This enables us to lookup a cgroup by its id.

v4:
- add a comment for idr_remove() in cgroup_offline_fn().

v3:
- on success, idr_alloc() returns the id but not 0, so fix the BUG_ON()
  in cgroup_init().
- pass the right value to idr_alloc() so that the id for dummy cgroup is 0.

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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