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Commit c1200697 authored by Dave Jones's avatar Dave Jones
Browse files

[CPUFREQ] Remove hotplug cpu crap 



The hotplug CPU locking in cpufreq is horrendous.  No-one seems to care
enough to fix it, so just remove it so that the 99.9% of the real world
users of this code can use cpufreq without being bothered by warnings.

Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 86acd49a

drivers/cpufreq/cpufreq.c

+0 −16
Original line number Diff line number Diff line
@@ -415,12 +415,10 @@ static ssize_t store_##file_name \ 
	if (ret != 1)							\

		return -EINVAL;						\

									\

	lock_cpu_hotplug();						\

	mutex_lock(&policy->lock);					\

	ret = __cpufreq_set_policy(policy, &new_policy);		\

	policy->user_policy.object = policy->object;			\

	mutex_unlock(&policy->lock);					\

	unlock_cpu_hotplug();						\

									\

	return ret ? ret : count;					\

}
@@ -479,8 +477,6 @@ static ssize_t store_scaling_governor (struct cpufreq_policy * policy, 
						&new_policy.governor))

		return -EINVAL;



	lock_cpu_hotplug();



	/* Do not use cpufreq_set_policy here or the user_policy.max

	   will be wrongly overridden */

	mutex_lock(&policy->lock);
@@ -490,8 +486,6 @@ static ssize_t store_scaling_governor (struct cpufreq_policy * policy, 
	policy->user_policy.governor = policy->governor;

	mutex_unlock(&policy->lock);



	unlock_cpu_hotplug();



	if (ret)

		return ret;

	else
@@ -1278,7 +1272,6 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier); 
 *********************************************************************/





/* Must be called with lock_cpu_hotplug held */

int __cpufreq_driver_target(struct cpufreq_policy *policy,

			    unsigned int target_freq,

			    unsigned int relation)
@@ -1304,13 +1297,11 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, 
	if (!policy)

		return -EINVAL;



	lock_cpu_hotplug();

	mutex_lock(&policy->lock);



	ret = __cpufreq_driver_target(policy, target_freq, relation);



	mutex_unlock(&policy->lock);

	unlock_cpu_hotplug();



	cpufreq_cpu_put(policy);

	return ret;
@@ -1338,7 +1329,6 @@ int cpufreq_driver_getavg(struct cpufreq_policy *policy) 
EXPORT_SYMBOL_GPL(cpufreq_driver_getavg);



/*

 * Locking: Must be called with the lock_cpu_hotplug() lock held

 * when "event" is CPUFREQ_GOV_LIMITS

 */
@@ -1433,7 +1423,6 @@ EXPORT_SYMBOL(cpufreq_get_policy); 
/*

 * data   : current policy.

 * policy : policy to be set.

 * Locking: Must be called with the lock_cpu_hotplug() lock held

 */

static int __cpufreq_set_policy(struct cpufreq_policy *data,

				struct cpufreq_policy *policy)
@@ -1539,8 +1528,6 @@ int cpufreq_set_policy(struct cpufreq_policy *policy) 
	if (!data)

		return -EINVAL;



	lock_cpu_hotplug();



	/* lock this CPU */

	mutex_lock(&data->lock);
@@ -1552,7 +1539,6 @@ int cpufreq_set_policy(struct cpufreq_policy *policy) 


	mutex_unlock(&data->lock);



	unlock_cpu_hotplug();

	cpufreq_cpu_put(data);



	return ret;
@@ -1576,7 +1562,6 @@ int cpufreq_update_policy(unsigned int cpu) 
	if (!data)

		return -ENODEV;



	lock_cpu_hotplug();

	mutex_lock(&data->lock);



	dprintk("updating policy for CPU %u\n", cpu);
@@ -1603,7 +1588,6 @@ int cpufreq_update_policy(unsigned int cpu) 
	ret = __cpufreq_set_policy(data, &policy);



	mutex_unlock(&data->lock);

	unlock_cpu_hotplug();

	cpufreq_cpu_put(data);

	return ret;

}

drivers/cpufreq/cpufreq_conservative.c

+0 −2
Original line number Diff line number Diff line
@@ -430,14 +430,12 @@ static void dbs_check_cpu(int cpu) 
static void do_dbs_timer(struct work_struct *work)

{ 

	int i;

	lock_cpu_hotplug();

	mutex_lock(&dbs_mutex);

	for_each_online_cpu(i)

		dbs_check_cpu(i);

	schedule_delayed_work(&dbs_work, 

			usecs_to_jiffies(dbs_tuners_ins.sampling_rate));

	mutex_unlock(&dbs_mutex);

	unlock_cpu_hotplug();

} 



static inline void dbs_timer_init(void)

drivers/cpufreq/cpufreq_ondemand.c

+0 −2
Original line number Diff line number Diff line
@@ -440,9 +440,7 @@ static void do_dbs_timer(struct work_struct *work) 
	dbs_info->sample_type = DBS_NORMAL_SAMPLE;

	if (!dbs_tuners_ins.powersave_bias ||

	    sample_type == DBS_NORMAL_SAMPLE) {

		lock_cpu_hotplug();

		dbs_check_cpu(dbs_info);

		unlock_cpu_hotplug();

		if (dbs_info->freq_lo) {

			/* Setup timer for SUB_SAMPLE */

			dbs_info->sample_type = DBS_SUB_SAMPLE;

drivers/cpufreq/cpufreq_stats.c

+0 −2
Original line number Diff line number Diff line
@@ -370,12 +370,10 @@ __exit cpufreq_stats_exit(void) 
	cpufreq_unregister_notifier(&notifier_trans_block,

			CPUFREQ_TRANSITION_NOTIFIER);

	unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);

	lock_cpu_hotplug();

	for_each_online_cpu(cpu) {

		cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier,

						CPU_DEAD, (void *)(long)cpu);

	}

	unlock_cpu_hotplug();

}



MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>");

drivers/cpufreq/cpufreq_userspace.c

+0 −2
Original line number Diff line number Diff line
@@ -71,7 +71,6 @@ static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy) 


	dprintk("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);



	lock_cpu_hotplug();

	mutex_lock(&userspace_mutex);

	if (!cpu_is_managed[policy->cpu])

		goto err;
@@ -94,7 +93,6 @@ static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy) 


 err:

	mutex_unlock(&userspace_mutex);

	unlock_cpu_hotplug();

	return ret;

}