linux-kernel - Re: [PATCH v3 1/3] x86, ACPI: rename init_freq_invariance_cppc to arch_init_invariance

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Message-ID: <CAJZ5v0jke695COCAkYNOzOcqF7yPPP5p-YPv+E8rOP=qqoVf9g@mail.gmail.com>
Date:   Tue, 8 Mar 2022 19:22:10 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ionela Voinescu <ionela.voinescu@....com>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Sean Kelley <skelley@...dia.com>,
        Pierre Gondois <pierre.gondois@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/3] x86, ACPI: rename init_freq_invariance_cppc to arch_init_invariance_cppc

On Tue, Mar 8, 2022 at 7:05 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> On Wed, Mar 2, 2022 at 7:10 PM Ionela Voinescu <ionela.voinescu@....com> wrote:
> >
> > init_freq_invariance_cppc() was called in acpi_cppc_processor_probe(),
> > after CPU performance information and controls were populated from the
> > per-cpu _CPC objects.
> >
> > But these _CPC objects provide information that helps with both CPU
> > (u-arch) and frequency invariance. Therefore, change the function name
> > to a more generic one, while adding the arch_ prefix, as this function
> > is expected to be defined differently by different architectures.
> >
> > Signed-off-by: Ionela Voinescu <ionela.voinescu@....com>
> > Tested-by: Valentin Schneider <valentin.schneider@....com>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Giovanni Gherdovich <ggherdovich@...e.cz>
> > Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

That said it will conflict with this series from Rui:

https://lore.kernel.org/linux-acpi/20220214101450.356047-1-ray.huang@amd.com/

applied by me a while ago.

Maybe consider rebasing when this gets to linux-next ->

> and who's expected to pick this up?

-> and then I guess I can pick it up if everybody agrees.

> > ---
> >  arch/x86/include/asm/topology.h | 2 +-
> >  drivers/acpi/cppc_acpi.c        | 6 +++---
> >  2 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
> > index 2f0b6be8eaab..5ec70f186775 100644
> > --- a/arch/x86/include/asm/topology.h
> > +++ b/arch/x86/include/asm/topology.h
> > @@ -223,7 +223,7 @@ static inline void arch_set_max_freq_ratio(bool turbo_disabled)
> >
> >  #if defined(CONFIG_ACPI_CPPC_LIB) && defined(CONFIG_SMP)
> >  void init_freq_invariance_cppc(void);
> > -#define init_freq_invariance_cppc init_freq_invariance_cppc
> > +#define arch_init_invariance_cppc init_freq_invariance_cppc
> >  #endif
> >
> >  #endif /* _ASM_X86_TOPOLOGY_H */
> > diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
> > index 866560cbb082..bfd142ab4e07 100644
> > --- a/drivers/acpi/cppc_acpi.c
> > +++ b/drivers/acpi/cppc_acpi.c
> > @@ -633,8 +633,8 @@ static bool is_cppc_supported(int revision, int num_ent)
> >   *  )
> >   */
> >
> > -#ifndef init_freq_invariance_cppc
> > -static inline void init_freq_invariance_cppc(void) { }
> > +#ifndef arch_init_invariance_cppc
> > +static inline void arch_init_invariance_cppc(void) { }
> >  #endif
> >
> >  /**
> > @@ -816,7 +816,7 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
> >                 goto out_free;
> >         }
> >
> > -       init_freq_invariance_cppc();
> > +       arch_init_invariance_cppc();
> >
> >         kfree(output.pointer);
> >         return 0;
> > --
> > 2.25.1
> >