From: Tejun Heo <tj@kernel.org>
Date: Fri, 9 Aug 2013 00:11:22 +0000 (-0400)
Subject: cgroup: add subsystem pointer to cgroup_subsys_state
X-Git-Tag: v3.12-rc1~173^2~44
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72c97e54e0f043d33b246d7460ae0a36c4b8c643;p=pandora-kernel.git

cgroup: add subsystem pointer to cgroup_subsys_state

Currently, given a cgroup_subsys_state, there's no way to find out
which subsystem the css is for, which we'll need to convert the cgroup
controller API to primarily use @css instead of @cgroup.  This patch
adds cgroup_subsys_state->ss which points to the subsystem the @css
belongs to.

While at it, remove the comment about accessing @css->cgroup to
determine the hierarchy.  cgroup core will provide API to traverse
hierarchy of css'es and we don't want subsystems to directly walk
cgroup hierarchies anymore.

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