int shmem_zero_setup(struct vm_area_struct *);
#ifndef CONFIG_MMU
+--- a/kernel/signal.c
++++ b/kernel/signal.c
+@@ -1053,6 +1053,7 @@ struct sighand_struct *lock_task_sighand
+
+ return sighand;
+ }
++EXPORT_SYMBOL(lock_task_sighand);
+
+ /*
+ * send signal info to all the members of a group