diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 426a0026225c29085d8e09c7f4920c6edbd216be..30aba80858e3f26058467d05a4c8c28b0383053f 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4221,6 +4221,7 @@ css_next_descendant_pre(struct cgroup_subsys_state *pos,
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(css_next_descendant_pre);
 
 /**
  * css_rightmost_descendant - return the rightmost descendant of a css