linux-kernel - Re: [PATCH] x86/cpufeatures: Move the definition of X86_FEATURE_AMX

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Date:   Tue, 18 Jan 2022 09:11:47 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Like Xu <like.xu.linux@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jing Liu <jing2.liu@...el.com>, linux-kernel@...r.kernel.org,
        "Bae, Chang Seok" <chang.seok.bae@...el.com>
Subject: Re: [PATCH] x86/cpufeatures: Move the definition of X86_FEATURE_AMX_*
 to the word 18

What tree is this against?  I see BF16 and INT8 in some old versions of
Chang's patches, but not current kernels.  All I see right now in
tip/master is:

> #define X86_FEATURE_AMX_TILE            (18*32+24) /* AMX tile ...

It's still in the wrong spot, but the other two features aren't there.

> We have defined the word 18 for Intel-defined CPU features from CPUID level> 0x00000007:0 (EDX). Let's move the definitions of X86_FEATURE_AMX_* to
the> right entry to prevent misinterpretation. No functional change
intended.
Please, no "we's" in changelogs.  Don't say, "let's move".  Just say:
"Move..."

The subject could probably also be trimmed a bit.  Perhaps:

	x86/cpu: Move AMX CPU feature defines to correct word location