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x86: disable IRQs before doing anything on nmi_shootdown_cpus()

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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>
This commit is contained in:
Eduardo Habkost 2008-11-12 11:34:44 -02:00 committed by Ingo Molnar
parent bb8dd270e6
commit c415b3dce3
1 changed files with 1 additions and 0 deletions
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arch/x86/kernel/reboot.c
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@ -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();