1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index b8ad1ea9958..0c621604baa 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -397,7 +397,7 @@ struct cftype {
 	 * This callback must be implemented, if you want provide
 	 * notification functionality.
 	 */
-	int (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,
+	void (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,
 			struct eventfd_ctx *eventfd);
 };
 
@@ -530,6 +530,7 @@ static inline struct cgroup_subsys_state *task_subsys_state(
 {
 	return rcu_dereference_check(task->cgroups->subsys[subsys_id],
 				     rcu_read_lock_held() ||
+				     lockdep_is_held(&task->alloc_lock) ||
 				     cgroup_lock_is_held());
 }