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Commit 4296f23e authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

cpufreq: schedutil: Fix per-CPU structure initialization in sugov_start() 



sugov_start() only initializes struct sugov_cpu per-CPU structures
for shared policies, but it should do that for single-CPU policies too.

That in particular makes the IO-wait boost mechanism work in the
cases when cpufreq policies correspond to individual CPUs.

Fixes: 21ca6d2c (cpufreq: schedutil: Add iowait boosting)
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Cc: 4.9+ <stable@vger.kernel.org> # 4.9+
parent 97da3854

kernel/sched/cpufreq_schedutil.c

+7 −13
Original line number Diff line number Diff line
@@ -584,21 +584,15 @@ static int sugov_start(struct cpufreq_policy *policy) 
	for_each_cpu(cpu, policy->cpus) {

		struct sugov_cpu *sg_cpu = &per_cpu(sugov_cpu, cpu);



		memset(sg_cpu, 0, sizeof(*sg_cpu));

		sg_cpu->sg_policy = sg_policy;

		if (policy_is_shared(policy)) {

			sg_cpu->util = 0;

			sg_cpu->max = 0;

		sg_cpu->flags = SCHED_CPUFREQ_RT;

			sg_cpu->last_update = 0;

			sg_cpu->iowait_boost = 0;

		sg_cpu->iowait_boost_max = policy->cpuinfo.max_freq;

		cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,

						     sugov_update_shared);

		} else {

			cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,

					     policy_is_shared(policy) ?

							sugov_update_shared :

							sugov_update_single);

	}

	}

	return 0;

}