1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 9a23bb098205..7d824b80b3d7 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -135,6 +135,10 @@ enum {
         CGRP_RELEASABLE,
         /* Control Group requires release notifications to userspace */
         CGRP_NOTIFY_ON_RELEASE,
+        /*
+         * A thread in rmdir() is wating for this cgroup.
+         */
+        CGRP_WAIT_ON_RMDIR,
 };
 
 struct cgroup {
@@ -360,7 +364,7 @@ int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);
 struct cgroup_subsys {
         struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss,
                                                   struct cgroup *cgrp);
-        void (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
+        int (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
         void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
         int (*can_attach)(struct cgroup_subsys *ss,
                           struct cgroup *cgrp, struct task_struct *tsk);