[S390] No panic for failed reboot

If reboot fails (e.g. because wrong devno has been specified by the user),
we should just stop all cpus, but should not trigger a kernel panic.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 36f0d30..60ba145 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -697,7 +697,8 @@
 		diag308(DIAG308_IPL, NULL);
 		break;
 	}
-	panic("reipl failed!\n");
+	printk(KERN_EMERG "reboot failed!\n");
+	signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 }
 
 static void do_dump(void)