linux-kernel - Re: [PATCH v4 6/7] cpufreq: Support for fast frequency switching

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Message-ID: <CAJZ5v0jNNc+HJZUy-T5fSFAdaQxPF+ZRGKGut=ZSLfCCcnYD0A@mail.gmail.com>
Date:	Wed, 16 Mar 2016 17:58:52 +0100
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Juri Lelli <juri.lelli@....com>,
	Steve Muckle <steve.muckle@...aro.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 6/7] cpufreq: Support for fast frequency switching

On Wed, Mar 16, 2016 at 4:35 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Mar 16, 2016 at 03:52:28PM +0100, Rafael J. Wysocki wrote:
>> +/**
>> + * cpufreq_enable_fast_switch - Enable fast frequency switching for policy.
>> + * @policy: cpufreq policy to enable fast frequency switching for.
>> + *
>> + * Try to enable fast frequency switching for @policy.
>> + *
>> + * The attempt will fail if there is at least one transition notifier registered
>> + * at this point, as fast frequency switching is quite fundamentally at odds
>> + * with transition notifiers.  Thus if successful, it will make registration of
>> + * transition notifiers fail going forward.
>> + *
>> + * Call under policy->rwsem.
>
> Nobody reads a comment..
>
>> + */
>> +void cpufreq_enable_fast_switch(struct cpufreq_policy *policy)
>> +{
>
>         lockdep_assert_held(&policy->rwsem);
>
> While everybody complains when there's a big nasty splat in their dmesg
> ;-)

OK