linux-kernel - Re: [PATCH V2 3/4] cpufreq: Add Kconfig option to enable/disable have_multiple

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Date:	Fri, 22 Feb 2013 07:44:23 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, linaro-dev@...ts.linaro.org,
	francescolavra.fl@...il.com, toddpoynor@...gle.com,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH V2 3/4] cpufreq: Add Kconfig option to enable/disable have_multiple_policies

On 22 February 2013 05:23, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Monday, February 11, 2013 01:20:02 PM Viresh Kumar wrote:

>> +config CPU_FREQ_HAVE_MULTIPLE_POLICIES
>> +     bool
>> +
>
> So I suppose some architectures will select this, right?

Yes. And they have to enable have_multiple_policies too from their
drivers init code.

> What architecture they are?

Atleast all big.LITTLE SoCs. Or any other SoC that has multiple policy
structs alive at any time.


> I'm not really sure I like this. ->

>>  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;
>
> -> I wonder why don't you arrange things so that policy->kobj is always
> returned, but it points to cpufreq_global_kobject in case there's only one
> (i.e. make policy->kobj a pointer)?

policy->kobj is a struct instance rather than a pointer and it is widely used
within cpufreq.c. If you don't like this one then we can add another entry
into struct policy like: gov_sysfs_parent.
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