commit c731ae1d0f02a300697a8b1564780ad28a6c2013
author Li Zefan <lizefan@huawei.com> Thu Jun 05 17:16:30 2014 +0800
committer Tejun Heo <tj@kernel.org> Thu Jun 05 09:52:51 2014 -0400
tree 4887aaada0e6f6328449bc41d4b4e2b911c29df2
parent 1f779fb28aa07350d72976d304591d216ca86f0e

cgroup: disallow disabled controllers on the default hierarchy

After booting with cgroup_disable=memory, I still saw memcg files
in the default hierarchy, and I can write to them, though it won't
take effect.

  # dmesg
  ...
  Disabling memory control group subsystem
  ...
  # mount -t cgroup -o __DEVEL__sane_behavior xxx /cgroup
  # ls /cgroup
  ...
  memory.failcnt                   memory.move_charge_at_immigrate
  memory.force_empty               memory.numa_stat
  memory.limit_in_bytes            memory.oom_control
  ...
  # cat /cgroup/memory.usage_in_bytes
  0

tj: Minor comment update.

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