linux-kernel - Re: 2.6.26, PAT and AMD family 6

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Message-ID: <20080507230628.GM18516@elf.ucw.cz>
Date:	Thu, 8 May 2008 01:06:28 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.26, PAT and AMD family 6

On Wed 2008-05-07 15:45:18, Yinghai Lu wrote:
> On Wed, May 7, 2008 at 3:39 PM, Pavel Machek <pavel@...e.cz> wrote:
> > On Wed 2008-05-07 15:23:46, Yinghai Lu wrote:
> >  > >  2) HPA said it was bad idea
> >  >
> >  > hpa said white list is not a good idea.
> >
> >  And guess what your patch is doing?
> >
> >
> >  +       switch (c->x86_vendor) {
> >  +       case X86_VENDOR_AMD:
> >  +               if (c->x86 >= 0xf && c->x86 <= 0x11)
> >  +                       set_cpu_cap(c, X86_FEATURE_PAT);
> >  +               break;
> >  +       case X86_VENDOR_INTEL:
> >  +               if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >=
> >  15))
> >  +                       set_cpu_cap(c, X86_FEATURE_PAT);
> >  +               break;
> >  +       }
> >
> >  Seems like a whitelist to me. Will break with future CPUs.
> 
> again, i only increased the whitelist a little bit to support AMD
> opteron Rev E, Rev F and Fam10h that I could access.

(Which is what your commit log should have said, btw).

> the code handle future cpus should reach the kernel list before SW
> developer could get system....

There's no reason why 2.6.26 should not work reasonably on cpus
released in 2015.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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