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Subject: Re: [PATCH -next v2 1/1] cpufreq: CPPC: Fix unused-function warning
To:     Pierre Gondois <pierre.gondois@arm.com>,
        <linux-kernel@vger.kernel.org>
CC:     <Ionela.Voinescu@arm.com>, <Dietmar.Eggemann@arm.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        <linux-pm@vger.kernel.org>
References: <20220530100424.103301-1-pierre.gondois@arm.com>
 <20220530100424.103301-2-pierre.gondois@arm.com>
From:   Shaokun Zhang <zhangshaokun@hisilicon.com>
Message-ID: <f2b9386a-16dd-bd03-4972-aaa026f72c03@hisilicon.com>
Date:   Mon, 30 May 2022 19:55:55 +0800
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Hi,

It works for me on compile when CONFIG_ENERGY_MODEL=n, please feel free to add:
Tested-by: Shaokun Zhang <zhangshaokun@hisilicon.com>

Thanks,
Shaokun

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@hisilicon.com>
> Signed-off-by: Pierre Gondois <pierre.gondois@arm.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;
>