-/* Callback for CPUs which aren't supposed to do anything. */
-static int chill(void *unused)
-{
- return 0;
-}
-
-int stop_machine_create(void)
-{
- mutex_lock(&setup_lock);
- if (refcount)
- goto done;
- stop_machine_wq = create_rt_workqueue("kstop");
- if (!stop_machine_wq)
- goto err_out;
- stop_machine_work = alloc_percpu(struct work_struct);
- if (!stop_machine_work)
- goto err_out;
-done:
- refcount++;
- mutex_unlock(&setup_lock);
- return 0;
-
-err_out:
- if (stop_machine_wq)
- destroy_workqueue(stop_machine_wq);
- mutex_unlock(&setup_lock);
- return -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(stop_machine_create);
-
-void stop_machine_destroy(void)
-{
- mutex_lock(&setup_lock);
- refcount--;
- if (refcount)
- goto done;
- destroy_workqueue(stop_machine_wq);
- free_percpu(stop_machine_work);
-done:
- mutex_unlock(&setup_lock);
-}
-EXPORT_SYMBOL_GPL(stop_machine_destroy);
-