linux-kernel - Re: [RESEND PATCH V2 4/9] x86/msr: Add the MSR definition for AMD CPPC boost state

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Date:   Fri, 21 Oct 2022 11:37:54 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Huang Rui <ray.huang@....com>
Cc:     "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Yuan, Perry" <Perry.Yuan@....com>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH V2 4/9] x86/msr: Add the MSR definition for AMD
 CPPC boost state

On Fri, Oct 21, 2022 at 01:22:11PM +0800, Huang Rui wrote:
> > > If I rename that the MSR definition string, that will cause lots of driver file
> > > change.
> > > So I suggest to add one new MSR macro for the CPPC, the MSR_K7_HWCR is
> > > mismatching in the CPPC Pstate driver.
> > > If you refuse to use this new one, I will reuse that old one.
> > 
> > To avoid changing too much stuff at once how about if you give an alias?
> > IE something like:
> > 
> > #define MSR_AMD_CPPC_HW_CTL MSR_K7_HWCR

Why would you all even think about adding a new name and not use
MSR_K7_HWCR?

The other code uses it just fine, do git grep MSR_K7_HWCR.

We have waaay too many MSRs, no need to unnecessarily confuse people
with an alias or rename stuff. Just use MSR_K7_HWCR like everything else
does.

-- 
Regards/Gruss,
    Boris.

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