Re: IO_APIC NMI Watchdog not handled by suspend/resume.

[Zwane Mwaikambo]

Hi Nigel

On Fri, 5 Nov 2004, Nigel Cunningham wrote:

> Tracking down SMP problems, I've found that if you boot with
> nmi_watchdog=1 (IO_APIC), the watchdog continues to run while suspend is
> doing sensitive things like restoring the original kernel. I don't know
> enough to provide a patch to disable it so thought I'd ask if someone
> could volunteer to fix this?

Use enable/disable_lapic_nmi_watchdog but first  check to see whether 
nmi_watchdog == NMI_IO_APIC in which case you'd then call 
disable/enable_timer_nmi_watchdog. Something like;

void swsuspend_disable_nmi_watchdog(void)
{
	if ((nmi_watchdog == NMI_IO_APIC) && (smp_processor_id() == 0)) {
		disable_timer_nmi_watchdog();
		return;
	}

	disable_lapic_nmi_watchdog();
}

void swsuspend_enable_nmi_watchdog(void)
{
	if ((nmi_watchdog == NMI_IO_APIC) && (smp_processor_id() == 0)) {
		enable_timer_nmi_watchdog();
		return;
	}

	enable_lapic_nmi_watchdog();
}

Do note that this has to be run on all processors, holla if there is 
anything else.

Thanks,
	Zwane

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