linux-kernel - Re: [PATCH V3 1/4] cpufreq: handle calls to ->target

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Date:	Tue, 20 May 2014 09:44:15 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arvind Chauhan <arvind.chauhan@....com>,
	Stephen Warren <swarren@...dia.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>
Subject: Re: [PATCH V3 1/4] cpufreq: handle calls to ->target_index() in
 separate routine

Viresh,

On Fri, May 16, 2014 at 9:51 PM, Viresh Kumar <viresh.kumar@...aro.org> 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>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  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..9bf12a2 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;

I'm not sure that this shuffling was really necessary, but I guess it
doesn't hurt.  ...and I guess a CL that's shuffling code anyway is the
place to put it...

Reviewed-by: Doug Anderson <dianders@...omium.org>
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