diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 8675c69..ff9055f 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -318,6 +318,7 @@
 					struct cgroup_iter *it);
 void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it);
 int cgroup_scan_tasks(struct cgroup_scanner *scan);
+int cgroup_attach_task(struct cgroup *, struct task_struct *);
 
 #else /* !CONFIG_CGROUPS */