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    Subject[PATCH] [7/11] i386: Do not include other cpus' interrupt 0 in nmi_watchdog
    Date

    From: Keith Owens <kaos@ocs.com.au>
    kstat_irqs(0) includes the count of interrupt 0 from all cpus, not just
    the current cpu. The updated interrupt 0 on other cpus can stop the
    nmi_watchdog from tripping, so only include the current cpu's int 0.

    Signed-off-by: Keith Owens <kaos@ocs.com.au>
    Signed-off-by: Andi Kleen <ak@suse.de>

    ---
    arch/i386/kernel/nmi.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    Index: linux/arch/i386/kernel/nmi.c
    ===================================================================
    --- linux.orig/arch/i386/kernel/nmi.c
    +++ linux/arch/i386/kernel/nmi.c
    @@ -353,7 +353,7 @@ __kprobes int nmi_watchdog_tick(struct p
    * Take the local apic timer and PIT/HPET into account. We don't
    * know which one is active, when we have highres/dyntick on
    */
    - sum = per_cpu(irq_stat, cpu).apic_timer_irqs + kstat_irqs(0);
    + sum = per_cpu(irq_stat, cpu).apic_timer_irqs + kstat_cpu(cpu).irqs[0];

    /* if the none of the timers isn't firing, this cpu isn't doing much */
    if (!touched && last_irq_sums[cpu] == sum) {
    -
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