linux-kernel - Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core

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Date:	Wed, 19 Jun 2013 10:48:53 -0700
From:	Dirk Brandewie <dirk.brandewie@...il.com>
To:	Lukasz Majewski <l.majewski@...sung.com>
CC:	Viresh Kumar <viresh.kumar@...aro.org>,
	"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>,
	dirk.brandewie@...il.com
Subject: Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core

On 06/19/2013 10:12 AM, Lukasz Majewski wrote:
> This commit adds boost frequency support in cpufreq core (Hardware &

> +/*********************************************************************
>    *               REGISTER / UNREGISTER CPUFREQ DRIVER                *
>    *********************************************************************/
>
> @@ -1936,6 +2019,16 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
>   	cpufreq_driver = driver_data;
>   	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
>
> +	if (!cpufreq_driver->boost_supported)
> +		boost.attr.mode = 0444;
> +
> +	ret = cpufreq_sysfs_create_file(&(boost.attr));
> +	if (ret) {
> +		pr_err("%s: cannot register global boost sysfs file\n",
> +		       __func__);
> +		goto err_null_driver;
> +	}
> +

I do not think the boost sysfs should be created at all if boost is not
supported.

For intel_pstate the read-only boost would be there for no reason and would
cause confusion on the part of the user IMHO

>   	ret = subsys_interface_register(&cpufreq_interface);
>   	if (ret)
>   		goto err_null_driver;
> @@ -1992,6 +2085,8 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
>   	pr_debug("unregistering driver %s\n", driver->name);
>
>   	subsys_interface_unregister(&cpufreq_interface);
> +
> +	cpufreq_sysfs_remove_file(&(boost.attr));
>   	unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
>

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