static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
{
+diff --git a/kernel/fork.c b/kernel/fork.c
+index 9b42695..852499e 100644
+--- a/kernel/fork.c
++++ b/kernel/fork.c
+@@ -159,6 +159,7 @@ void __put_task_struct(struct task_struct *tsk)
+ if (!profile_handoff_task(tsk))
+ free_task(tsk);
+ }
++EXPORT_SYMBOL(__put_task_struct);
+
+ /*
+ * macro override instead of weak attribute alias, to workaround