linux-kernel - Re: [PATCH 05/17] thermal: cpu_cooling: remove cpufreq_cooling_get

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Date:   Tue, 11 Apr 2017 10:43:43 -0700
From:   Eduardo Valentin <edubezval@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>,
        Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 05/17] thermal: cpu_cooling: remove
 cpufreq_cooling_get_level()

On Thu, Mar 16, 2017 at 10:59:40AM +0530, Viresh Kumar wrote:
> There is only one user of cpufreq_cooling_get_level() and that already
> has pointer to the cpufreq_dev structure. It can directly call
> get_level() instead and we can get rid of cpufreq_cooling_get_level().
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/thermal/cpu_cooling.c | 33 +--------------------------------
>  include/linux/cpu_cooling.h   |  6 ------
>  2 files changed, 1 insertion(+), 38 deletions(-)
> 
> diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
> index e2931c20c309..99dc6833de75 100644
> --- a/drivers/thermal/cpu_cooling.c
> +++ b/drivers/thermal/cpu_cooling.c
> @@ -137,37 +137,6 @@ static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_dev,
>  }
>  
>  /**
> - * cpufreq_cooling_get_level - for a given cpu, return the cooling level.
> - * @cpu: cpu for which the level is required
> - * @freq: the frequency of interest
> - *
> - * This function will match the cooling level corresponding to the
> - * requested @freq and return it.
> - *
> - * Return: The matched cooling level on success or THERMAL_CSTATE_INVALID
> - * otherwise.
> - */
> -unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
> -{
> -	struct cpufreq_cooling_device *cpufreq_dev;
> -
> -	mutex_lock(&cooling_list_lock);
> -	list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
> -		if (cpumask_test_cpu(cpu, &cpufreq_dev->allowed_cpus)) {
> -			unsigned long level = get_level(cpufreq_dev, freq);
> -
> -			mutex_unlock(&cooling_list_lock);
> -			return level;
> -		}
> -	}
> -	mutex_unlock(&cooling_list_lock);
> -
> -	pr_err("%s: cpu:%d not part of any cooling device\n", __func__, cpu);
> -	return THERMAL_CSTATE_INVALID;
> -}
> -EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level);
> -
> -/**
>   * cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
>   * @nb:	struct notifier_block * with callback info.
>   * @event: value showing cpufreq event for which this function invoked.
> @@ -698,7 +667,7 @@ static int cpufreq_power2state(struct thermal_cooling_device *cdev,
>  	normalised_power = (dyn_power * 100) / last_load;
>  	target_freq = cpu_power_to_freq(cpufreq_dev, normalised_power);
>  
> -	*state = cpufreq_cooling_get_level(cpu, target_freq);
> +	*state = get_level(cpufreq_dev, target_freq);

Did I miss something or we are loosing semantics here?

I guess the idea at this point is to get the level corresponding to the
frequency on a specific cpu. Let's have a look on get_level()..

I guess now we can rely on the freq table held in the
cpufreq_cooling_device..

>  	if (*state == THERMAL_CSTATE_INVALID) {
>  		dev_err_ratelimited(&cdev->device,
>  				    "Failed to convert %dKHz for cpu %d into a cdev state\n",
> diff --git a/include/linux/cpu_cooling.h b/include/linux/cpu_cooling.h
> index c156f5082758..96c5e4c2f9c8 100644
> --- a/include/linux/cpu_cooling.h
> +++ b/include/linux/cpu_cooling.h
> @@ -82,7 +82,6 @@ of_cpufreq_power_cooling_register(struct device_node *np,
>   */
>  void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);
>  
> -unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq);
>  #else /* !CONFIG_CPU_THERMAL */
>  static inline struct thermal_cooling_device *
>  cpufreq_cooling_register(const struct cpumask *clip_cpus)
> @@ -117,11 +116,6 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
>  {
>  	return;
>  }
> -static inline
> -unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
> -{
> -	return THERMAL_CSTATE_INVALID;
> -}
>  #endif	/* CONFIG_CPU_THERMAL */
>  
>  #endif /* __CPU_COOLING_H__ */
> -- 
> 2.7.1.410.g6faf27b
> 

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