From: Tejun Heo <tj@kernel.org>
Date: Tue, 25 Jun 2013 18:53:37 +0000 (-0700)
Subject: cgroup: reserve ID 0 for dummy_root and 1 for unified hierarchy
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~44^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc76df706123602214da494ba98bccea83e2cfff;p=pandora-kernel.git

cgroup: reserve ID 0 for dummy_root and 1 for unified hierarchy

Before 1a57423166 ("cgroup: make hierarchy_id use cyclic idr"),
hierarchy IDs were allocated from 0.  As the dummy hierarchy was
always the one first initialized, it got assigned 0 and all other
hierarchies from 1.  The patch accidentally changed the minimum
useable ID to 2.

Let's restore ID 0 for dummy_root and while at it reserve 1 for
unified hierarchy.

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

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