[PATCH] ppc64: call idle_task_exit from cpu_die

Call idle_task_exit from cpu_die to avoid mm_struct leak.
Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/setup.c

@@ -1345,6 +1345,7 @@ early_param("xmon", early_xmon);
 
 void cpu_die(void)
 {
+	idle_task_exit();
 	if (ppc_md.cpu_die)
 		ppc_md.cpu_die();
 	local_irq_disable();