From: Tejun Heo <tj@kernel.org>
Date: Sun, 4 May 2014 19:09:13 +0000 (-0400)
Subject: cgroup, memcg: allocate cgroup ID from 1
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~81^2~58
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d699ddb2b181a2c76e5ea18b1bdf102c4bebe4b;p=pandora-kernel.git

cgroup, memcg: allocate cgroup ID from 1

Currently, cgroup->id is allocated from 0, which is always assigned to
the root cgroup; unfortunately, memcg wants to use ID 0 to indicate
invalid IDs and ends up incrementing all IDs by one.

It's reasonable to reserve 0 for special purposes.  This patch updates
cgroup core so that ID 0 is not used and the root cgroups get ID 1.
The ID incrementing is removed form memcg.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Li Zefan <lizefan@huawei.com>
---

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