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SubjectRe: [X86] Add recent Centaur CPUs to PAT whitelist
On Mon, May 19, 2008 at 9:09 PM, Dave Jones <davej@redhat.com> wrote:
> From conversation with Centaur engineers, both the newer generations
> of the VIA C7, and their future CPUs support PAT, with no known errata.
>
> Signed-off-by: Dave Jones <davej@redhat.com>
>
> diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
> index c2e1ce3..638a3a6 100644
> --- a/arch/x86/kernel/cpu/addon_cpuid_features.c
> +++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
> @@ -62,6 +81,10 @@ void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
> if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
> return;
> break;
> + case X86_VENDOR_CENTAUR:
> + if ((c->x86 > 6) || (c->x86 == 6 && c->x86_model >= 10))
> + set_cpu_cap(c, X86_FEATURE_PAT);
> + break;
> }
>
> pat_disable(cpu_has_pat ?

you may need to return early...

> + case X86_VENDOR_CENTAUR:
> + if ((c->x86 > 6) || (c->x86 == 6 && c->x86_model >= 10)) {
> + set_cpu_cap(c, X86_FEATURE_PAT); /* may not need, if cpuid already has that set */
> + return;
> + }
> + break;

YH


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