linux-kernel - Re: [PATCH] x86: pat cpu feature bit setting for known cpus

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Date:	Sun, 30 Mar 2008 04:43:26 -0700 (PDT)
From:	dean gaudet <dean@...tic.org>
To:	yhlu.kernel@...il.com
cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: pat cpu feature bit setting for known cpus

On Mon, 24 Mar 2008, Yinghai Lu wrote:

> [PATCH] x86: pat cpu feature bit setting for known cpus
> 
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> 
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index eb94460..b186047 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -309,6 +309,19 @@ static void __cpuinit early_get_cap(struct cpuinfo_x86 *c)
>  
>  	}
>  
> +	clear_cpu_cap(c, X86_FEATURE_PAT);
> +
> +	switch (c->x86_vendor) {
> +	case X86_VENDOR_AMD:
> +		if (c->x86 >= 0xf && c->x86 <= 0x11)
> +			set_cpu_cap(c, X86_FEATURE_PAT);

just a general comment on things like this... "x->x86 <= 0x11" ensures 
this file will have to be updated every time a new AMD CPU is released.


> +		break;
> +	case X86_VENDOR_INTEL:
> +		if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))

note that you didn't limit intel the same way... at least for the numerous 
core2 processor models.

-dean
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