iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cpufreq: Notify governors when cpus are hot-[un]plugged

Browse Source 
Because cpufreq core and governors worry only about the online cpus, if a cpu is
hot [un]plugged, we must notify governors about it, otherwise be ready to expect
something unexpected.

We already have notifiers in the form of CPUFREQ_GOV_START/CPUFREQ_GOV_STOP, we
just need to call them now.

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 2013-01-12 05:14:39 +00:00 committed by Rafael J. Wysocki
parent 643ae6e81d
commit f6a7409cab
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/cpufreq/cpufreq.c
View File

@ -751,11 +751,16 @@ static int cpufreq_add_dev_policy(unsigned int cpu,
return -EBUSY; return -EBUSY;
} }
__cpufreq_governor(managed_policy, CPUFREQ_GOV_STOP);
spin_lock_irqsave(&cpufreq_driver_lock, flags); spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpumask_copy(managed_policy->cpus, policy->cpus); cpumask_copy(managed_policy->cpus, policy->cpus);
per_cpu(cpufreq_cpu_data, cpu) = managed_policy; per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags); spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
__cpufreq_governor(managed_policy, CPUFREQ_GOV_START);
__cpufreq_governor(managed_policy, CPUFREQ_GOV_LIMITS);
pr_debug("CPU already managed, adding link\n"); pr_debug("CPU already managed, adding link\n");
ret = sysfs_create_link(&dev->kobj, ret = sysfs_create_link(&dev->kobj,
&managed_policy->kobj, &managed_policy->kobj,
@ -1066,8 +1071,13 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
*/ */
if (unlikely(cpu != data->cpu)) { if (unlikely(cpu != data->cpu)) {
pr_debug("removing link\n"); pr_debug("removing link\n");
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
cpumask_clear_cpu(cpu, data->cpus); cpumask_clear_cpu(cpu, data->cpus);
spin_unlock_irqrestore(&cpufreq_driver_lock, flags); spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
__cpufreq_governor(data, CPUFREQ_GOV_START);
__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
kobj = &dev->kobj; kobj = &dev->kobj;
cpufreq_cpu_put(data); cpufreq_cpu_put(data);
unlock_policy_rwsem_write(cpu); unlock_policy_rwsem_write(cpu);