linux-kernel - Re: [PATCH V3 4/4] cpufreq: Add Kconfig option to enable/disable have_multiple

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Date:	Tue, 12 Mar 2013 00:38:57 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	robin.randhawa@....com, Steve.Bannister@....com,
	Liviu.Dudau@....com, charles.garcia-tobin@....com
Subject: Re: [PATCH V3 4/4] cpufreq: Add Kconfig option to enable/disable have_multiple_policies

On Monday, March 04, 2013 03:37:56 PM Viresh Kumar wrote:
> have_multiple_policies is required by platforms having multiple clock-domains
> for cpus, i.e. supporting multiple policies for cpus. This patch adds in a
> Kconfig option for enabling execution of this code.
> 
> Reported-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/cpufreq/Kconfig | 3 +++
>  include/linux/cpufreq.h | 4 ++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index cbcb21e..e6e6939 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -23,6 +23,9 @@ config CPU_FREQ_TABLE
>  config CPU_FREQ_GOV_COMMON
>  	bool
>  
> +config CPU_FREQ_HAVE_MULTIPLE_POLICIES
> +	bool
> +
>  config CPU_FREQ_STAT
>  	tristate "CPU frequency translation statistics"
>  	select CPU_FREQ_TABLE
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index 6e1abd2..a092fcb 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -107,11 +107,13 @@ struct cpufreq_policy {
>  	unsigned int		policy; /* see above */
>  	struct cpufreq_governor	*governor; /* see below */
>  	void			*governor_data;
> +#ifdef CONFIG_CPU_FREQ_HAVE_MULTIPLE_POLICIES
>  	/* This should be set by init() of platforms having multiple
>  	 * clock-domains, i.e.  supporting multiple policies. With this sysfs
>  	 * directories of governor would be created in cpu/cpu<num>/cpufreq/
>  	 * directory */
>  	bool			have_multiple_policies;
> +#endif
>  
>  	struct work_struct	update; /* if update_policy() needs to be
>  					 * called, but you're in IRQ context */
> @@ -142,9 +144,11 @@ static inline bool policy_is_shared(struct cpufreq_policy *policy)
>  static inline struct kobject *
>  get_governor_parent_kobj(struct cpufreq_policy *policy)
>  {
> +#ifdef CONFIG_CPU_FREQ_HAVE_MULTIPLE_POLICIES
>  	if (policy->have_multiple_policies)
>  		return &policy->kobj;
>  	else
> +#endif
>  		return cpufreq_global_kobject;
>  }

One more question before I apply it.

Is there any architecture/platform that will set
CONFIG_CPU_FREQ_HAVE_MULTIPLE_POLICIES and keep have_multiple_policies unset
at the same time?

Rafael


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