linux-kernel - Re: [PATCH v2 1/1] x86,sched: On AMD EPYC set freq_max = max

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Date:   Wed, 03 Feb 2021 10:12:06 +0100
From:   Giovanni Gherdovich <ggherdovich@...e.cz>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Jon Grimm <Jon.Grimm@....com>,
        Nathan Fontenot <Nathan.Fontenot@....com>,
        Yazen Ghannam <Yazen.Ghannam@....com>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Suthikulpanit Suravee <Suravee.Suthikulpanit@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pu Wen <puwen@...on.cn>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Michael Larabel <Michael@...ronix.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] x86,sched: On AMD EPYC set freq_max = max_boost
 in schedutil invariant formula

On Tue, 2021-02-02 at 19:59 +0100, Rafael J. Wysocki wrote:
> On Fri, Jan 22, 2021 at 9:47 PM Giovanni Gherdovich <ggherdovich@...e.cz> wrote:
> > 
> 
> [cut]
> 
> > diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> > index 1e4fbb002a31..2378bc1bf2c4 100644
> > --- a/drivers/cpufreq/acpi-cpufreq.c
> > +++ b/drivers/cpufreq/acpi-cpufreq.c
> > @@ -27,6 +27,10 @@
> > 
> >  #include <acpi/processor.h>
> > 
> > +#ifdef CONFIG_ACPI_CPPC_LIB
> 
> Why is the #ifdef needed here?
> 

Right, it isn't needed. The guard is necessary only later when the function
cppc_get_perf_caps() is used. I'll send a v3 with this correction.


Giovanni


> > +#include <acpi/cppc_acpi.h>
> > +#endif
> > +
> >  #include <asm/msr.h>
> >  #include <asm/processor.h>
> >  #include <asm/cpufeature.h>