From c415b3dce30dfb41234e118662e8720f47343a4f Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Wed, 12 Nov 2008 11:34:44 -0200
Subject: [PATCH] x86: disable IRQs before doing anything on
nmi_shootdown_cpus()
Impact: make nmi_shootdown_cpus() callable from preemptible context
We need to know on which CPU we are running on, and we don't want to be
preempted while doing this.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/reboot.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 17a41e055565..c3cd512484e5 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -577,6 +577,7 @@ static struct notifier_block crash_nmi_nb = {
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
{
unsigned long msecs;
+ local_irq_disable();
/* Make a note of crashing cpu. Will be used in NMI callback.*/
crashing_cpu = safe_smp_processor_id();