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cgroup: fix broken css_has_online_children()

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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>
This commit is contained in:
Li Zefan 2014-06-12 14:31:31 +08:00 • committed by Tejun Heo
commit 99bae5f941
1 changed files with 1 additions and 1 deletions
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2
kernel/cgroup.c
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@ -3328,7 +3328,7 @@ bool css_has_online_children(struct cgroup_subsys_state *css)
rcu_read_lock();
css_for_each_child(child, css) {
if (css->flags & CSS_ONLINE) {
if (child->flags & CSS_ONLINE) {
ret = true;
break;
}