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Date: Wed, 16 Mar 2016 17:58:52 +0100
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Subject: Re: [PATCH v4 6/7] cpufreq: Support for fast frequency switching
From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Linux PM list <linux-pm@vger.kernel.org>,
        Juri Lelli <juri.lelli@arm.com>,
        Steve Muckle <steve.muckle@linaro.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
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        Michael Turquette <mturquette@baylibre.com>,
        Ingo Molnar <mingo@kernel.org>
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On Wed, Mar 16, 2016 at 4:35 PM, Peter Zijlstra <peterz@infradead.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