linux-kernel - Re: [PATCH -next v2 1/1] cpufreq: CPPC: Fix unused-function warning

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Date:   Mon, 30 May 2022 15:36:16 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Pierre Gondois <pierre.gondois@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ionela Voinescu <Ionela.Voinescu@....com>,
        Dietmar Eggemann <Dietmar.Eggemann@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH -next v2 1/1] cpufreq: CPPC: Fix unused-function warning

On Mon, May 30, 2022 at 1:56 PM Shaokun Zhang
<zhangshaokun@...ilicon.com> wrote:
>
> Hi,
>
> It works for me on compile when CONFIG_ENERGY_MODEL=n, please feel free to add:
> Tested-by: Shaokun Zhang <zhangshaokun@...ilicon.com>

Applied, thanks!

> On 2022/5/30 18:04, Pierre Gondois wrote:
> > Building the cppc_cpufreq driver with for arm64 with
> > CONFIG_ENERGY_MODEL=n triggers the following warnings:
> >  drivers/cpufreq/cppc_cpufreq.c:550:12: error: ‘cppc_get_cpu_cost’ defined but not used
> > [-Werror=unused-function]
> >    550 | static int cppc_get_cpu_cost(struct device *cpu_dev, unsigned long KHz,
> >        |            ^~~~~~~~~~~~~~~~~
> >  drivers/cpufreq/cppc_cpufreq.c:481:12: error: ‘cppc_get_cpu_power’ defined but not used
> > [-Werror=unused-function]
> >    481 | static int cppc_get_cpu_power(struct device *cpu_dev,
> >        |            ^~~~~~~~~~~~~~~~~~
> >
> > Move the Energy Model related functions into specific guards.
> > This allows to fix the warning and prevent doing extra work
> > when the Energy Model is not present.
> >
> > Fixes: 740fcdc2c20e ("cpufreq: CPPC: Register EM based on efficiency class information")
> > Reported-by: Shaokun Zhang <zhangshaokun@...ilicon.com>
> > Signed-off-by: Pierre Gondois <pierre.gondois@....com>
> > ---
> >  drivers/cpufreq/cppc_cpufreq.c | 17 ++++++++---------
> >  1 file changed, 8 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
> > index f0a8bb2c59e5..24eaf0ec344d 100644
> > --- a/drivers/cpufreq/cppc_cpufreq.c
> > +++ b/drivers/cpufreq/cppc_cpufreq.c
> > @@ -441,6 +441,14 @@ static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
> >       }
> >       return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
> >  }
> > +#else
> > +static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
> > +{
> > +     return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
> > +}
> > +#endif
> > +
> > +#if defined(CONFIG_ARM64) && defined(CONFIG_ENERGY_MODEL)
> >
> >  static DEFINE_PER_CPU(unsigned int, efficiency_class);
> >  static void cppc_cpufreq_register_em(struct cpufreq_policy *policy);
> > @@ -621,21 +629,12 @@ static void cppc_cpufreq_register_em(struct cpufreq_policy *policy)
> >  }
> >
> >  #else
> > -
> > -static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
> > -{
> > -     return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
> > -}
> >  static int populate_efficiency_class(void)
> >  {
> >       return 0;
> >  }
> > -static void cppc_cpufreq_register_em(struct cpufreq_policy *policy)
> > -{
> > -}
> >  #endif
> >
> > -
> >  static struct cppc_cpudata *cppc_cpufreq_get_cpu_data(unsigned int cpu)
> >  {
> >       struct cppc_cpudata *cpu_data;
> >