Re: [PATCH -tip] perf, x86: fix unknown NMIs on a Pentium4 box

[Don Zickus]

On Thu, Apr 14, 2011 at 11:43:25PM +0400, Cyrill Gorcunov wrote:
> On 04/14/2011 10:46 PM, Ingo Molnar wrote:
> > 
> > btw., the bug went away once i removed your patch so it's 100% sure caused by 
> > this change.
> > 
> > Thanks,
> > 
> > 	Ingo
> 
> Ingo if you have a chance mind to give this patch a shot please? Seems we might miss unmasking
> for inflight nmis.

I don't think this patch will work.  It would make sense if the unmasking
happened _after_ the "if (!handled)" path, but that is not the path Ingo
wanted for v1.

Cheers,
Don

> -	apic_write(APIC_LVTPC, APIC_DM_NMI);
> 
>  	handled = x86_pmu.handle_irq(args->regs);
> +	apic_write(APIC_LVTPC, APIC_DM_NMI);

^^^^ all handled/unhandled NMIs hit that apic_write
>  	if (!handled)
>  		return NOTIFY_DONE;
> 
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