linux-kernel - Re: [PATCH v4 1/7] cpufreq: Store cpufreq policies in a list

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Date:	Wed, 26 Jun 2013 16:05:12 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	"Rafael J. Wysocky" <rjw@...k.pl>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Andre Przywara <andre.przywara@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: Re: [PATCH v4 1/7] cpufreq: Store cpufreq policies in a list

On 19 June 2013 22:42, Lukasz Majewski <l.majewski@...sung.com> wrote:
> Policies available in a cpufreq framework are now linked together. They are
> accessible via cpufreq_policy_list defined at cpufreq core.
>
> Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
>
> Changes for v4:
> - New patch

You need to write changelog after ---, so that it doesn't get commited.

> ---
>  drivers/cpufreq/cpufreq.c |    3 +++
>  include/linux/cpufreq.h   |    1 +
>  2 files changed, 4 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 2ce86ed..665e641 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -46,6 +46,7 @@ static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
>  static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
>  #endif
>  static DEFINE_RWLOCK(cpufreq_driver_lock);
> +static LIST_HEAD(cpufreq_policy_list);
>
>  /*
>   * cpu_policy_rwsem is a per CPU reader-writer semaphore designed to cure
> @@ -989,6 +990,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
>         }
>  #endif
>
> +       list_add(&policy->policy_list, &cpufreq_policy_list);
>         ret = cpufreq_add_dev_interface(cpu, policy, dev);
>         if (ret)
>                 goto err_out_unregister;

what about handling error cases?

> @@ -1992,6 +1994,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
>         subsys_interface_unregister(&cpufreq_interface);
>         unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
>
> +       list_del(&cpufreq_policy_list);
>         write_lock_irqsave(&cpufreq_driver_lock, flags);
>         cpufreq_driver = NULL;
>         write_unlock_irqrestore(&cpufreq_driver_lock, flags);
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index ab1932c..5348981 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -117,6 +117,7 @@ struct cpufreq_policy {
>
>         struct cpufreq_real_policy      user_policy;
>
> +       struct list_head        policy_list;
>         struct kobject          kobj;
>         struct completion       kobj_unregister;

--
viresh
--
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