Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fix from Tejun Heo:
 "A late fix for cgroup.

  This fixes a behavior regression visible to userland which was created
  by a commit merged during -rc1.  While the behavior change isn't too
  likely to be noticeable, the fix is relatively low risk and we'll need
  to backport it through -stable anyway if the bug gets released"

* 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cpuset: fix a regression in validating config change

1 files changed, 9 insertions, 5 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 010a0083c0ae..ea1966db34f2 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -475,13 +475,17 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
 
         /*
          * Cpusets with tasks - existing or newly being attached - can't
-         * have empty cpus_allowed or mems_allowed.
+         * be changed to have empty cpus_allowed or mems_allowed.
          */
         ret = -ENOSPC;
-        if ((cgroup_task_count(cur->css.cgroup) || cur->attach_in_progress) &&
-            (cpumask_empty(trial->cpus_allowed) &&
-             nodes_empty(trial->mems_allowed)))
-                goto out;
+        if ((cgroup_task_count(cur->css.cgroup) || cur->attach_in_progress)) {
+                if (!cpumask_empty(cur->cpus_allowed) &&
+                    cpumask_empty(trial->cpus_allowed))
+                        goto out;
+                if (!nodes_empty(cur->mems_allowed) &&
+                    nodes_empty(trial->mems_allowed))
+                        goto out;
+        }
 
         ret = 0;
 out: