From b5557c4c3b1a38074d7001b87c2482eda3a0834a Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Fri, 22 Nov 2013 18:20:42 -0500
Subject: [PATCH] memcg: cgroup_write_event_control() now knows @css is for
 memcg

@css for cgroup_write_event_control() is now always for memcg and the
target file should be a memcg file too.  Drop code which assumes @css
is dummy_css and the target file may belong to different subsystems.

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>
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Reading git-format-patch failed