From: Li Zefan <lizefan@huawei.com>
Date: Thu, 12 Jun 2014 06:31:31 +0000 (+0800)
Subject: cgroup: fix broken css_has_online_children()
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~319^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99bae5f94185c2cc65701e95c54e31e2f4345b88;p=pandora-kernel.git

cgroup: fix broken css_has_online_children()

After running:

  # mount -t cgroup cpu xxx /cgroup && mkdir /cgroup/sub && \
    rmdir /cgroup/sub && umount /cgroup

I found the cgroup root still existed:

  # cat /proc/cgroups
  #subsys_name    hierarchy       num_cgroups     enabled
  cpuset  0       1       1
  cpu     1       1       1
  ...

It turned out css_has_online_children() is broken.

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