linux-kernel - Re: [PATCH v4 06/22] cpufreq: amd: introduce a new amd pstate driver to support future processors

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Message-ID: <YZefaRePXGLNDSpP@hirez.programming.kicks-ass.net>
Date:   Fri, 19 Nov 2021 13:58:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
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>,
        Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...nel.org>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        "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>,
        Steven Noonan <steven@...vesoftware.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 v4 06/22] cpufreq: amd: introduce a new amd pstate driver
 to support future processors

On Fri, Nov 19, 2021 at 07:16:05PM +0800, Huang Rui wrote:
> On Fri, Nov 19, 2021 at 06:46:58PM +0800, Peter Zijlstra wrote:
> > On Fri, Nov 19, 2021 at 06:30:46PM +0800, Huang Rui wrote:
> > > +static inline int pstate_enable(bool enable)
> > > +{
> > > +	return wrmsrl_safe(MSR_AMD_CPPC_ENABLE, enable ? 1 : 0);
> > 
> > Strictly speaking that ?: is superfluous, a _Bool when cast to scalar
> > type will have exactly that value.
> 
> Right. Will update it to "wrmsrl_safe(MSR_AMD_CPPC_ENABLE, enable)".

I think there was one more site that did this. You don't *need* to
change it, but it's something I noted while reading through the thing.

Over-all I think the series looks nice. Thanks for doing this.