[PATCH RT] have x86_64 nmi watchdog also count irq 0

[Steven Rostedt <rostedt@goodmis.org>]

I was getting false reports about NMI lockups on CPU 3.  For some reason
CPU 0,1 and 2 where using apic timer, and CPU 3 was using the irq 0
timer.

This patch makes the NMI watchdog count both the apic timer and the irq0
timer.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Index: linux-2.6-rt-test/arch/x86_64/kernel/nmi.c
===================================================================
--- linux-2.6-rt-test.orig/arch/x86_64/kernel/nmi.c
+++ linux-2.6-rt-test/arch/x86_64/kernel/nmi.c
@@ -938,7 +938,7 @@ int notrace __kprobes nmi_watchdog_tick(
 		touched = 1;
 	}
 
-	sum = read_pda(apic_timer_irqs);
+	sum = read_pda(apic_timer_irqs) + kstat_cpu(cpu).irqs[0];
 
 	if (__get_cpu_var(nmi_touch)) {
 		__get_cpu_var(nmi_touch) = 0;


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