[PATCH] kdump x86_64 nmi event notification fix

After a crash we should wait for NMI IPI event and not for external NMI or
NMI watchdog tick.
Signed-off-by: NVivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>

arch/x86_64/kernel/crash.c

@@ -102,7 +102,7 @@ static int crash_nmi_callback(struct notifier_block *self,
 	struct pt_regs *regs;
 	int cpu;
 
-	if (val != DIE_NMI)
+	if (val != DIE_NMI_IPI)
 		return NOTIFY_OK;
 
 	regs = ((struct die_args *)data)->regs;
@@ -114,7 +114,7 @@ static int crash_nmi_callback(struct notifier_block *self,
 	 * an NMI if system was initially booted with nmi_watchdog parameter.
 	 */
 	if (cpu == crashing_cpu)
-		return 1;
+		return NOTIFY_STOP;
 	local_irq_disable();
 
 	crash_save_this_cpu(regs, cpu);