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authorViresh Kumar <viresh.kumar@linaro.org>2015-05-12 12:22:12 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-05-15 02:38:18 +0200
commit9104bb26c740cd4b2c9ee927f3caabbde0414558 (patch)
tree5852c9111d6d152c5f12b01d08ffd6c6e26b902e /drivers/cpufreq
parent3914d37910af2cd0cc992ae546b8308e05759d2b (diff)
downloadblackbird-op-linux-9104bb26c740cd4b2c9ee927f3caabbde0414558.tar.gz
blackbird-op-linux-9104bb26c740cd4b2c9ee927f3caabbde0414558.zip
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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index eb0c3a802b14..e6a63d6ba6f1 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1213,16 +1213,13 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
return 0;
/* Check if this CPU already has a policy to manage it */
- read_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_active_policy(policy) {
- if (cpumask_test_cpu(cpu, policy->related_cpus)) {
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
- ret = cpufreq_add_policy_cpu(policy, cpu, dev);
- up_read(&cpufreq_rwsem);
- return ret;
- }
+ policy = per_cpu(cpufreq_cpu_data, cpu);
+ if (policy && !policy_is_inactive(policy)) {
+ WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus));
+ ret = cpufreq_add_policy_cpu(policy, cpu, dev);
+ up_read(&cpufreq_rwsem);
+ return ret;
}
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
/*
* Restore the saved policy when doing light-weight init and fall back
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