[PATCH] s390: add dummy pm_power_off

Define a dummy pm_power_off pointer to make sys_reboot happy.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/s390/kernel/setup.c

@@ -315,6 +315,11 @@ void machine_power_off(void)
 	_machine_power_off();
 }
 
+/*
+ * Dummy power off function.
+ */
+void (*pm_power_off)(void) = machine_power_off;
+
 static void __init
 add_memory_hole(unsigned long start, unsigned long end)
 {