diff --git a/[refs] b/[refs]
index 6df80a59044f..8f9f64dddec9 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1c6c3fad81787e8cb4c85ddfd573b0d8442fe630
+refs/heads/master: c6ca57500c23d57a4ccec9874b6a3c99c297e1b5
diff --git a/trunk/kernel/cgroup.c b/trunk/kernel/cgroup.c
index 421557fcbfe4..c6bd67b3fcf6 100644
--- a/trunk/kernel/cgroup.c
+++ b/trunk/kernel/cgroup.c
@@ -2825,6 +2825,7 @@ static void cgroup_enable_task_cg_lists(void)
 }
 
 void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it)
+	__acquires(css_set_lock)
 {
 	/*
 	 * The first time anyone tries to iterate across a cgroup,
@@ -2864,6 +2865,7 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
 }
 
 void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it)
+	__releases(css_set_lock)
 {
 	read_unlock(&css_set_lock);
 }