From: Tejun Heo <tj@kernel.org>
Date: Mon, 26 Aug 2013 22:40:56 +0000 (-0400)
Subject: cgroup: make cgroup_event hold onto cgroup_subsys_state instead of cgroup
X-Git-Tag: v3.12-rc1~173^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7941cb027dccedec3c047271554ddcf4be2e0697;p=pandora-kernel.git

cgroup: make cgroup_event hold onto cgroup_subsys_state instead of cgroup

Currently, each registered cgroup_event holds an extra reference to
the cgroup.  This is a bit weird as events are subsystem specific and
will also be incorrect in the planned unified hierarchy as css
(cgroup_subsys_state) may come and go dynamically across the lifetime
of a cgroup.  Holding onto cgroup won't prevent the target css from
going away.

Update cgroup_event to hold onto the css the traget file belongs to
instead of cgroup.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---

Reading git-diff-tree failed