linux-kernel - Re: [PATCH 3/7] mtrr: Remove use

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Message-ID: <4B1FF48B.4020202@zytor.com>
Date:	Wed, 09 Dec 2009 11:03:39 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Micha? Miros?aw <mirq-linux@...e.qmqm.pl>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH 3/7] mtrr: Remove use_intel()

On 12/09/2009 10:32 AM, Yinghai Lu wrote:
> /*
>  * Generic structure...
>  */
> struct mtrr_ops generic_mtrr_ops = {
>         .use_intel_if           = 1,
>         .set_all                = generic_set_all,
> 
> so all cpus that cpuid tell us that there is mtrr support, will all
> have use_intel() == 1

Yes, because the right thing to check isn't the CPU vendor bit but the
CPU feature bits -- all CPUs that have the MTRR feature bit are using
the "Intel interface" -- regardless of if they are made by Intel, AMD,
VIA, or Transmeta.  The older AMD, Cyrix etc. interfaces use different bits.

	-hpa

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