linux-kernel - Re: [RFC PATCH] x86/cpufeatures: Enumerate new AVX512 bfloat16 instructions

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Message-ID: <20190612035908.GB32652@zn.tnic>
Date:   Wed, 12 Jun 2019 05:59:08 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Yu, Fenghua" <fenghua.yu@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [RFC PATCH] x86/cpufeatures: Enumerate new AVX512 bfloat16
 instructions

On Wed, Jun 12, 2019 at 03:29:57AM +0000, Yu, Fenghua wrote:
> My bad. I studied a bit more and found the patch #1 is not needed.

Why, I think you were spot-on:

"And the two variables are ONLY used in resctrl monitoring
configuration. There is no need to store them in cpuinfo_x86 on each
CPU."

That was a real overkill to put them in cpuinfo_x86. The information
needed should simply be read out in rdt_get_mon_l3_config() and that's
it - no need to global values to store them.

Now removing them should be in a separate patch so that review is easy.

Or am I missing an aspect?

-- 
Regards/Gruss,
    Boris.

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