linux-kernel - Re: [PATCH 07/10] cpufreq: Add support for x86 cpuinfo auto loading

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Message-ID: <4EEA9CB2.9020709@zytor.com>
Date:	Thu, 15 Dec 2011 17:19:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Borislav Petkov <bp@...64.org>, linux-kernel@...r.kernel.org,
	kay.sievers@...y.org, trenn@...e.de,
	Andi Kleen <ak@...ux.intel.com>, davej@...hat.com
Subject: Re: [PATCH 07/10] cpufreq: Add support for x86 cpuinfo auto loading

On 12/08/2011 06:37 AM, Andi Kleen wrote:
>> Well, there is CPUID_8000_0007_EDX[7] which denotes the presence
>> of the P-state registers. It probably could be added to
>> init_scattered_cpuid_features() but there's still special handling
>> needed for K8.
> 
> Dave is probably right that it's not worth moving the list.
> 
>> Can you do both a family and a feature bit test with the autoprobing
>> code?
> 

Another similar question: is it possible to key a load on more than one
CPU feature?  It's fairly common that you need more than one feature for
a specific piece of code to function, and it would be good to be able to
represent it.

	-hpa


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