linux-kernel - Re: [PATCH] cpufreq: intel_pstate: remove obsolete functions

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Date:   Thu, 7 Jan 2021 18:24:29 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, Tom Rix <trix@...hat.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: intel_pstate: remove obsolete functions

On Mon, Dec 21, 2020 at 11:21 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> On Mon, Dec 21, 2020 at 06:13:20AM +0100, Lukas Bulwahn wrote:
> > percent_fp() was used in intel_pstate_pid_reset(), which was removed in
> > commit 9d0ef7af1f2d ("cpufreq: intel_pstate: Do not use PID-based P-state
> > selection") and hence, percent_fp() is unused since then.
> >
> > percent_ext_fp() was last used in intel_pstate_update_perf_limits(), which
> > was refactored in commit 1a4fe38add8b ("cpufreq: intel_pstate: Remove
> > max/min fractions to limit performance"), and hence, percent_ext_fp() is
> > unused since then.
> >
> > make CC=clang W=1 points us those unused functions:
> >
> > drivers/cpufreq/intel_pstate.c:79:23: warning: unused function 'percent_fp' [-Wunused-function]
> > static inline int32_t percent_fp(int percent)
> >                       ^
> >
> > drivers/cpufreq/intel_pstate.c:94:23: warning: unused function 'percent_ext_fp' [-Wunused-function]
> > static inline int32_t percent_ext_fp(int percent)
> >                       ^
> >
> > Remove those obsolete functions.
> >
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
>
> Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
>
> > ---
> > applies cleanly on current master and next-20201221
> >
> > Srinivas, Len, Rafael, Viresh, please pick this minor non-urgent cleanup patch.
> >
> >  drivers/cpufreq/intel_pstate.c | 10 ----------
> >  1 file changed, 10 deletions(-)
> >
> > diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> > index 2a4db856222f..0e35dd247986 100644
> > --- a/drivers/cpufreq/intel_pstate.c
> > +++ b/drivers/cpufreq/intel_pstate.c
> > @@ -76,11 +76,6 @@ static inline int ceiling_fp(int32_t x)
> >       return ret;
> >  }
> >
> > -static inline int32_t percent_fp(int percent)
> > -{
> > -     return div_fp(percent, 100);
> > -}
> > -
> >  static inline u64 mul_ext_fp(u64 x, u64 y)
> >  {
> >       return (x * y) >> EXT_FRAC_BITS;
> > @@ -91,11 +86,6 @@ static inline u64 div_ext_fp(u64 x, u64 y)
> >       return div64_u64(x << EXT_FRAC_BITS, y);
> >  }
> >
> > -static inline int32_t percent_ext_fp(int percent)
> > -{
> > -     return div_ext_fp(percent, 100);
> > -}
> > -
> >  /**
> >   * struct sample -   Store performance sample
> >   * @core_avg_perf:   Ratio of APERF/MPERF which is the actual average
> > --

Applied as 5.11-rc material, thanks!