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cpufreq: Store cpufreq policies in a list

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Policies available in the cpufreq framework are now linked together.
They are accessible via cpufreq_policy_list defined in the cpufreq
core.

[rjw: Fix from Yinghai Lu folded in]
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
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:
Lukasz Majewski 2013-08-06 22:53:08 +05:30 committed by Rafael J. Wysocki
parent d5b73cd870
commit c88a1f8b96
2 changed files with 13 additions and 0 deletions
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12
drivers/cpufreq/cpufreq.c
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@ -40,6 +40,7 @@ static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback);
static DEFINE_RWLOCK(cpufreq_driver_lock);
static DEFINE_MUTEX(cpufreq_governor_lock);
static LIST_HEAD(cpufreq_policy_list);
#ifdef CONFIG_HOTPLUG_CPU
/* This one keeps track of the previously set governor of a removed CPU */
@ -952,6 +953,7 @@ static struct cpufreq_policy *cpufreq_policy_alloc(void)
if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
goto err_free_cpumask;
INIT_LIST_HEAD(&policy->policy_list);
return policy;
err_free_cpumask:
@ -964,6 +966,12 @@ static struct cpufreq_policy *cpufreq_policy_alloc(void)
static void cpufreq_policy_free(struct cpufreq_policy *policy)
{
unsigned long flags;
write_lock_irqsave(&cpufreq_driver_lock, flags);
list_del(&policy->policy_list);
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
free_cpumask_var(policy->related_cpus);
free_cpumask_var(policy->cpus);
kfree(policy);
@ -1077,6 +1085,10 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
ret = cpufreq_add_dev_interface(policy, dev);
if (ret)
goto err_out_unregister;
write_lock_irqsave(&cpufreq_driver_lock, flags);
list_add(&policy->policy_list, &cpufreq_policy_list);
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
}
cpufreq_init_policy(policy);

1
include/linux/cpufreq.h
View File

@ -82,6 +82,7 @@ struct cpufreq_policy {
struct cpufreq_real_policy user_policy;
struct list_head policy_list;
struct kobject kobj;
struct completion kobj_unregister;
int transition_ongoing; /* Tracks transition status */