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List: linux-kernel
Subject: Re: [Patch] x86, x86_64: fix cpu model for family 0x6
From: Dave Jones <davej () redhat ! com>
Date: 2005-09-30 22:56:32
Message-ID: 20050930225632.GE15160 () redhat ! com
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On Sat, Oct 01, 2005 at 12:37:39AM +0200, Petr Vandrovec wrote:
> Siddha, Suresh B wrote:
> >On Sat, Oct 01, 2005 at 12:02:16AM +0200, Andi Kleen wrote:
> >
> >>I applied an earlier mix of your original one and Petr's suggestions.
> >>Hope it's ok.
> >
> >
> >Andi I prefer to follow the SDM guidelines. Who knows if future families
> >comeup with a different rule or use/initialize these extended model/family
> >bits differently. I am just being paranoid.
>
> And which chance is bigger - that such hypothetical processor will use
> extended model, and your code will get incorrect answer everywhere, or
> that such hypothetical processor will not use extended model, and your
> code will be right?
>
> >>+ if (c->x86 >= 0xf)
> >
> >
> >And also you have a typo. It should be 0x6.
>
> It is intentional. Maybe it could do BUG_ON(c->x86 < 0xf).
<complete speculation> Pentium M is family 6, so maybe this is
an indication we'll see em64t capable P-M's soon ? :)
Dave
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