linux-kernel - Re: [PATCH V4 1/3] cpufreq: handle calls to ->target

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Message-ID: <2164172.cubRkjSW1o@vostro.rjw.lan>
Date:	Tue, 27 May 2014 01:21:31 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, arvind.chauhan@....com,
	swarren@...dia.com, dianders@...omium.org, linux@....linux.org.uk,
	nicolas.pitre@...aro.org, thomas.abraham@...aro.org,
	pdeschrijver@...dia.com
Subject: Re: [PATCH V4 1/3] cpufreq: handle calls to ->target_index() in separate routine

On Wednesday, May 21, 2014 02:29:29 PM Viresh Kumar wrote:
> Handling calls to ->target_index() has got complex over time and might become
> more complex. So, its better to take target_index() bits out in another routine
> __target_index() for better code readability. Shouldn't have any functional
> impact.
> 
> Tested-by: Stephen Warren <swarren@...dia.com>
> Reviewed-by: Doug Anderson <dianders@...omium.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

I guess I can take this one without the rest of the series?

> ---
>  drivers/cpufreq/cpufreq.c | 56 ++++++++++++++++++++++++++++-------------------
>  1 file changed, 33 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index a05c921..ae11dd5 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1816,12 +1816,43 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier);
>   *                              GOVERNORS                            *
>   *********************************************************************/
>  
> +static int __target_index(struct cpufreq_policy *policy,
> +			  struct cpufreq_frequency_table *freq_table, int index)
> +{
> +	struct cpufreq_freqs freqs;
> +	int retval = -EINVAL;
> +	bool notify;
> +
> +	notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION);
> +
> +	if (notify) {
> +		freqs.old = policy->cur;
> +		freqs.new = freq_table[index].frequency;
> +		freqs.flags = 0;
> +
> +		pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n",
> +			 __func__, policy->cpu, freqs.old, freqs.new);
> +
> +		cpufreq_freq_transition_begin(policy, &freqs);
> +	}
> +
> +	retval = cpufreq_driver->target_index(policy, index);
> +	if (retval)
> +		pr_err("%s: Failed to change cpu frequency: %d\n", __func__,
> +		       retval);
> +
> +	if (notify)
> +		cpufreq_freq_transition_end(policy, &freqs, retval);
> +
> +	return retval;
> +}
> +
>  int __cpufreq_driver_target(struct cpufreq_policy *policy,
>  			    unsigned int target_freq,
>  			    unsigned int relation)
>  {
> -	int retval = -EINVAL;
>  	unsigned int old_target_freq = target_freq;
> +	int retval = -EINVAL;
>  
>  	if (cpufreq_disabled())
>  		return -ENODEV;
> @@ -1848,8 +1879,6 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
>  		retval = cpufreq_driver->target(policy, target_freq, relation);
>  	else if (cpufreq_driver->target_index) {
>  		struct cpufreq_frequency_table *freq_table;
> -		struct cpufreq_freqs freqs;
> -		bool notify;
>  		int index;
>  
>  		freq_table = cpufreq_frequency_get_table(policy->cpu);
> @@ -1870,26 +1899,7 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
>  			goto out;
>  		}
>  
> -		notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION);
> -
> -		if (notify) {
> -			freqs.old = policy->cur;
> -			freqs.new = freq_table[index].frequency;
> -			freqs.flags = 0;
> -
> -			pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n",
> -				 __func__, policy->cpu, freqs.old, freqs.new);
> -
> -			cpufreq_freq_transition_begin(policy, &freqs);
> -		}
> -
> -		retval = cpufreq_driver->target_index(policy, index);
> -		if (retval)
> -			pr_err("%s: Failed to change cpu frequency: %d\n",
> -			       __func__, retval);
> -
> -		if (notify)
> -			cpufreq_freq_transition_end(policy, &freqs, retval);
> +		retval = __target_index(policy, freq_table, index);
>  	}
>  
>  out:
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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