On 2013/8/15 23:43, Tejun Heo wrote:
>>From ced043264c9c3f03ab3c992af17461db50421dd8 Mon Sep 17 00:00:00 2001
> From: Tejun Heo <tj@xxxxxxxxxx>
> Date: Thu, 15 Aug 2013 11:37:54 -0400
>
> 81eeaf0411 ("cgroup: make cftype->[un]register_event() deal with
> cgroup_subsys_state inst ead of cgroup") updated the cftype event
> methods to take @css (cgroup_subsys_state) instead of @cgroup;
> however, it incorrectly used @css passed to
> cgroup_write_event_control(), which the dummy_css for the cgroup as
> the file is a cgroup core file. This leads to oops on event
> registration.
>
> Fix it by using the css matching the event target file. Note that
> cgroup_write_event_control() now disallows cgroup core files from
> being event sources. This is for simplicity and doesn't matter as
> cgroup_event will be moved and made specific to memcg.
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Acked-by: Li Zefan <lizefan@xxxxxxxxxx>
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