linux-kernel - Re: i686 quirk for AMD Geode

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Message-ID: <20091110055837.GB15338@1wt.eu>
Date:	Tue, 10 Nov 2009 06:58:37 +0100
From:	Willy Tarreau <w@....eu>
To:	Andres Salomon <dilinger@...labora.co.uk>
Cc:	Matteo Croce <technoboy85@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: i686 quirk for AMD Geode

On Sun, Nov 08, 2009 at 01:47:59PM -0500, Andres Salomon wrote:
> > Right, but what if is_geode_lx() is called befor the x86.id change
> > takes effect? Maybe something like this?
> > 
> > --- a/arch/x86/include/asm/geode.h 2009-11-08 19:13:43.531117343 +0100
> > +++ b/arch/x86/include/asm/geode.h      2009-11-08 19:19:42.130618023
> > +0100 @@ -177,7 +177,7 @@
> >  static inline int is_geode_lx(void)
> >  {
> >         return ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
> > -               (boot_cpu_data.x86 == 5) &&
> > +               (boot_cpu_data.x86 == 5 || boot_cpu_data.x86 == 6) &&
> >                 (boot_cpu_data.x86_model == 10));
> >  }
> 
> 
> Yeah, that looks better.

Wouldn't it be even better if we didn't touch boot_cpu_data.x86
in the first place ? We can provide the emulation to support
686 binaries without faking the CPU family/model, I think it
would be cleaner. Otherwise we would need to report "real" and
"emulated" families in /proc...

Willy

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