linux-kernel - Re: [PATCH 01/19] x86/cpufreatures: add AMD CPPC extension feature flag

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Date:   Mon, 13 Sep 2021 15:04:42 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Huang Rui <ray.huang@....com>
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 01/19] x86/cpufreatures: add AMD CPPC extension feature
 flag

On Mon, Sep 13, 2021 at 05:48:51PM +0800, Huang Rui wrote:
> This feature flag indicates the full MSR hardware solution of AMD
> P-States, if it is not set, that means we will go with in shared
> memory hardware solution. So we name this as extension.

Nobody cares whether it is an extension except you guys. Also, having
AMD_CPPC_EXT suggests there already is AMD_CPPC. But there isn't.

So call it X86_FEATURE_AMD_CPPC, please, for simplicity's sake.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette