linux-kernel - Re: [PATCH v6: 4/4] x86/cpufeature: Add R3MWAIT to CPU features

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Message-ID: <20161027170116.ee4zcyuz7qpmjarp@pd.tnic>
Date:   Thu, 27 Oct 2016 19:01:16 +0200
From:   Borislav Petkov <bp@...e.de>
To:     "Andrejczuk, Grzegorz" <grzegorz.andrejczuk@...el.com>
Cc:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "Daniluk, Lukasz" <lukasz.daniluk@...el.com>,
        "Cownie, James H" <james.h.cownie@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Luc, Piotr" <Piotr.Luc@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6: 4/4] x86/cpufeature: Add R3MWAIT to CPU features

On Thu, Oct 27, 2016 at 04:46:54PM +0000, Andrejczuk, Grzegorz wrote:
> I was reusing Word 3 as you suggested in patch rev. 1. There was idea
> to use init_scattered_cpuid_features.

I meant this word 3:

/* Other features, Linux-defined mapping, word 3 */
/* This range is used for feature bits which conflict or are synthesized */
#define X86_FEATURE_CXMMX       ( 3*32+ 0) /* Cyrix MMX extensions */
#define X86_FEATURE_K6_MTRR     ( 3*32+ 1) /* AMD K6 nonstandard MTRRs */
#define X86_FEATURE_CYRIX_ARR   ( 3*32+ 2) /* Cyrix ARRs (= MTRRs) */
...

i.e., the 4th word, if that makes more sense.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--