Re: Fwd: [PATCH] x86, MCE, AMD: save IA32_MCi_STATUS before machine_check_poll() resets it

Aravind Gopalakrishnan
2014-10-29T16:00:05Z

On 10/22/2014 4:30 AM, Borislav Petkov wrote:
> Hi Aravind,
>
> question: what's the story with MC?_MISC[IntP], is that bit still there?
> Because I don't see it in my BKDGs here.

Yep, It exists.
Maybe you are referring to Fam15h M0h BKDG? I think the bit was
introduced only from F15h M30h onwards.
The bit does *not* exist for bank=4, But-
if (bank ==4)
return true;

takes care of that.

> The background of the story is
>
> https://lkml.org/lkml/2014/10/7/84
>
> There's this thing we did at the time
>
> f227d4306cf3 ("x86, MCE, AMD: Make APIC LVT thresholding interrupt optional")
>
> which, AFAICR, is about some F15h versions having a counter but *not*
> generating a thresholding interrupt. Can you confirm that is still
> the case and we can have a counter but no interrupt gets generated on
> overflow?
>

So yes, moving the assignment inside the if condition should work just fine.

I see the patch on your 'ras-for-3.19' branch does not have this, so
I'll make this modification
to the branch before I test it.

Thanks,
-Aravind.