linux-kernel - Re: [PATCH 7/8] cpufreq: Add support for x86 cpuinfo auto loading v3

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Date:	Wed, 21 Dec 2011 16:08:55 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...ux.intel.com>
CC:	Dave Jones <davej@...hat.com>, Thomas Renninger <trenn@...e.de>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	kay.sievers@....org, kay.sievers@...y.org
Subject: Re: [PATCH 7/8] cpufreq: Add support for x86 cpuinfo auto loading
 v3

On 12/21/2011 04:01 PM, Andi Kleen wrote:
>> A synthetic one is pointless, because you'd just be duplicating something
>> similar to the above in generic code that would need updating for every new stepping.
> 
> powernow-k8 uses two mechanisms: family/models and on newer CPUs like
> Fam15 a CPUID bit.  Just not in the standard leaves. This would
> not need to be updated.
> 

So this should be:

1. added to the scattered CPUID features list;
2. artificially set in the AMD-specific initialization code for the
older CPUs.

	-hpa

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