linux-kernel - Re: [PATCH v3 9/10] cpufreq: sched: Re-introduce cpufreq_update

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Date:	Fri, 4 Mar 2016 13:21:42 -0800
From:	Steve Muckle <steve.muckle@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>
Cc:	Juri Lelli <juri.lelli@....com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.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 v3 9/10] cpufreq: sched: Re-introduce
 cpufreq_update_util()

On 03/04/2016 05:30 AM, Rafael J. Wysocki wrote:
> +void cpufreq_update_util(u64 time, unsigned long util, unsigned long max)
> +{
> +	struct freq_update_hook *hook;
> +
> +#ifdef CONFIG_LOCKDEP
> +	WARN_ON(debug_locks && !rcu_read_lock_sched_held());
> +#endif
> +
> +	hook = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_freq_update_hook));
> +	/*
> +	 * If this isn't inside of an RCU-sched read-side critical section, hook
> +	 * may become NULL after the check below.
> +	 */
> +	if (hook) {
> +		if (hook->update_util)
> +			hook->update_util(hook, time, util, max);
> +		else
> +			hook->func(hook, time);
> +	}

Is it worth having two hook types?