From: Eduardo Habkost <ehabkost@redhat.com>
Date: Wed, 12 Nov 2008 13:34:44 +0000 (-0200)
Subject: x86: disable IRQs before doing anything on nmi_shootdown_cpus()
X-Git-Tag: firefly_0821_release~16421^2~32^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c415b3dce30dfb41234e118662e8720f47343a4f;p=firefly-linux-kernel-4.4.55.git

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>
---

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();