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cpufreq: Don't traverse all active policies to find policy for a cpu

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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>
This commit is contained in:
Viresh Kumar 2015-05-12 12:22:12 +05:30 • committed by Rafael J. Wysocki
parent 3914d37910
commit 9104bb26c7
1 changed files with 6 additions and 9 deletions
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15
drivers/cpufreq/cpufreq.c
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@ -1213,16 +1213,13 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
return 0; return 0;
/* Check if this CPU already has a policy to manage it */ /* Check if this CPU already has a policy to manage it */
read_lock_irqsave(&cpufreq_driver_lock, flags); policy = per_cpu(cpufreq_cpu_data, cpu);
for_each_active_policy(policy) { if (policy && !policy_is_inactive(policy)) {
if (cpumask_test_cpu(cpu, policy->related_cpus)) { WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus));
read_unlock_irqrestore(&cpufreq_driver_lock, flags); ret = cpufreq_add_policy_cpu(policy, cpu, dev);
ret = cpufreq_add_policy_cpu(policy, cpu, dev); up_read(&cpufreq_rwsem);
up_read(&cpufreq_rwsem); return ret;
return ret;
}
} }
read_unlock_irqrestore(&cpufreq_driver_lock, flags);
/* /*
* Restore the saved policy when doing light-weight init and fall back * Restore the saved policy when doing light-weight init and fall back