1 files changed, 2 insertions, 15 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index d3f5fba2c159..c90eaa803440 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -500,21 +500,8 @@ struct cgroup_subsys {
         const char *name;
 
         /*
-         * Protects sibling/children links of cgroups in this
-         * hierarchy, plus protects which hierarchy (or none) the
-         * subsystem is a part of (i.e. root/sibling).  To avoid
-         * potential deadlocks, the following operations should not be
-         * undertaken while holding any hierarchy_mutex:
-         *
-         * - allocating memory
-         * - initiating hotplug events
-         */
-        struct mutex hierarchy_mutex;
-        struct lock_class_key subsys_key;
-
-        /*
          * Link to parent, and list entry in parent's children.
-         * Protected by this->hierarchy_mutex and cgroup_lock()
+         * Protected by cgroup_lock()
          */
         struct cgroupfs_root *root;
         struct list_head sibling;
@@ -602,7 +589,7 @@ int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
  * the lifetime of cgroup_subsys_state is subsys's matter.
  *
  * Looking up and scanning function should be called under rcu_read_lock().
- * Taking cgroup_mutex()/hierarchy_mutex() is not necessary for following calls.
+ * Taking cgroup_mutex is not necessary for following calls.
  * But the css returned by this routine can be "not populated yet" or "being
  * destroyed". The caller should check css and cgroup's status.
  */