cpuset: fix a warning when clearing configured masks in old hierarchy

commit 79063bffc81f82689bd90e16da1b49408f3bf095 upstream.

When we clear cpuset.cpus, cpuset.effective_cpus won't be cleared:

  # mount -t cgroup -o cpuset xxx /mnt
  # mkdir /mnt/tmp
  # echo 0 > /mnt/tmp/cpuset.cpus
  # echo > /mnt/tmp/cpuset.cpus
  # cat cpuset.cpus

  # cat cpuset.effective_cpus
  0-15

And a kernel warning in update_cpumasks_hier() is triggered:

 ------------[ cut here ]------------
 WARNING: CPU: 0 PID: 4028 at kernel/cpuset.c:894 update_cpumasks_hier+0x471/0x650()

Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 7e9d71130015d54245e48272533a9c0a2670395b..29463c26c83f96ed95e74c06baaf50cf21d6cc2e 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -873,7 +873,7 @@ static void update_cpumasks_hier(struct cpuset *cs, struct cpumask *new_cpus)
                 * If it becomes empty, inherit the effective mask of the
                 * parent, which is guaranteed to have some CPUs.
                 */
-               if (cpumask_empty(new_cpus))
+               if (cgroup_on_dfl(cp->css.cgroup) && cpumask_empty(new_cpus))
                        cpumask_copy(new_cpus, parent->effective_cpus);
 
                /* Skip the whole subtree if the cpumask remains the same. */
@@ -1129,7 +1129,7 @@ static void update_nodemasks_hier(struct cpuset *cs, nodemask_t *new_mems)
                 * If it becomes empty, inherit the effective mask of the
                 * parent, which is guaranteed to have some MEMs.
                 */
-               if (nodes_empty(*new_mems))
+               if (cgroup_on_dfl(cp->css.cgroup) && nodes_empty(*new_mems))
                        *new_mems = parent->effective_mems;
 
                /* Skip the whole subtree if the nodemask remains the same. */