linux-kernel - RE: [RESEND PATCH V2 7/9] cpufreq: amd_pstate: add AMD Pstate EPP support for the MSR based processors

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Date:   Tue, 11 Oct 2022 05:45:21 +0000
From:   "Yuan, Perry" <Perry.Yuan@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
CC:     "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "Huang, Ray" <Ray.Huang@....com>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....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 7/9] cpufreq: amd_pstate: add AMD Pstate EPP
 support for the MSR based processors

[AMD Official Use Only - General]

Hi Viresh. 

> -----Original Message-----
> From: Viresh Kumar <viresh.kumar@...aro.org>
> Sent: Tuesday, October 11, 2022 10:54 AM
> To: Yuan, Perry <Perry.Yuan@....com>
> Cc: rafael.j.wysocki@...el.com; Huang, Ray <Ray.Huang@....com>; Sharma,
> Deepak <Deepak.Sharma@....com>; Limonciello, Mario
> <Mario.Limonciello@....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-
> kernel@...r.kernel.org
> Subject: Re: [RESEND PATCH V2 7/9] cpufreq: amd_pstate: add AMD Pstate EPP
> support for the MSR based processors
> 
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
> 
> 
> On 11-10-22, 00:22, Perry Yuan wrote:
> > +static void amd_pstate_update_max_freq(unsigned int cpu) {
> > +     struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
> 
> Why isn't cpufreq_cpu_get() enough here ? cpufreq_cpu_acquire() is special as it
> takes policy->rwsem as well and you shouldn't need it.
> 
> > +
> > +     if (!policy)
> > +             return;
> > +
> > +     refresh_frequency_limits(policy);
> > +     cpufreq_cpu_release(policy);
> > +}
> 
> --
> Viresh

Thanks for your suggestion. I will try the cpufreq_cpu_get() and get this fixed in v3.

Perry .