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[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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dave Jones 2007-02-05 16:12:43 -08:00
parent 86acd49aa1
commit c120069779
5 changed files with 0 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/cpufreq/cpufreq.c
View File

@ -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;
}

2
drivers/cpufreq/cpufreq_conservative.c
View File

@ -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)

2
drivers/cpufreq/cpufreq_ondemand.c
View File

@ -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;

2
drivers/cpufreq/cpufreq_stats.c
View File

@ -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>");

2
drivers/cpufreq/cpufreq_userspace.c
View File

@ -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;
}