From: Michal Hocko <mhocko@suse.cz>
Date: Fri, 26 Oct 2012 11:37:29 +0000 (+0200)
Subject: memcg: root_cgroup cannot reach mem_cgroup_move_parent
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~57^2~47^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d842301181d9a4486aa24720ed4f96018b213292;p=pandora-kernel.git

memcg: root_cgroup cannot reach mem_cgroup_move_parent

The root cgroup cannot be destroyed so we never hit it down the
mem_cgroup_pre_destroy path and mem_cgroup_force_empty_write shouldn't
even try to do anything if called for the root.

This means that mem_cgroup_move_parent doesn't have to bother with the
root cgroup and it can assume it can always move charges upwards.

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

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