tree 9cb7db676c228bd7e3ea9fbd221a6303ca2628ee
parent ebe06187bf2aec10d537ce4595e416035367d703
author Li Zefan <lizefan@huawei.com> 1402554691 +0800
committer Tejun Heo <tj@kernel.org> 1403045573 -0400

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>