cpufreq: Don't traverse all active policies to find policy for a cpu
We reach here while adding policy for a CPU and enter into the 'if' block only if a policy already exists for the CPU. As cpufreq_cpu_data is set for all policy->related_cpus now, when the policy is first added, we can use that to find the CPU's policy instead of traversing the list of all active policies. Acked-by: Saravana Kannan <skannan@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -1213,16 +1213,13 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
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return 0;
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/* Check if this CPU already has a policy to manage it */
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read_lock_irqsave(&cpufreq_driver_lock, flags);
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for_each_active_policy(policy) {
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if (cpumask_test_cpu(cpu, policy->related_cpus)) {
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read_unlock_irqrestore(&cpufreq_driver_lock, flags);
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ret = cpufreq_add_policy_cpu(policy, cpu, dev);
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up_read(&cpufreq_rwsem);
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return ret;
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}
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policy = per_cpu(cpufreq_cpu_data, cpu);
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if (policy && !policy_is_inactive(policy)) {
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WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus));
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ret = cpufreq_add_policy_cpu(policy, cpu, dev);
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up_read(&cpufreq_rwsem);
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return ret;
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}
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read_unlock_irqrestore(&cpufreq_driver_lock, flags);
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/*
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* Restore the saved policy when doing light-weight init and fall back
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