75 } cpu_hotplug = {  variable
77 	.wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq),
78 	.lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
85 #define cpuhp_lock_acquire_read() lock_map_acquire_read(&cpu_hotplug.dep_map)
87 				  lock_map_acquire_tryread(&cpu_hotplug.dep_map)
88 #define cpuhp_lock_acquire()      lock_map_acquire(&cpu_hotplug.dep_map)
89 #define cpuhp_lock_release()      lock_map_release(&cpu_hotplug.dep_map)
95 	if (cpu_hotplug.active_writer == current)  in get_online_cpus()
98 	mutex_lock(&cpu_hotplug.lock);  in get_online_cpus()
99 	atomic_inc(&cpu_hotplug.refcount);  in get_online_cpus()
100 	mutex_unlock(&cpu_hotplug.lock);  in get_online_cpus()
106 	if (cpu_hotplug.active_writer == current)  in try_get_online_cpus()
108 	if (!mutex_trylock(&cpu_hotplug.lock))  in try_get_online_cpus()
111 	atomic_inc(&cpu_hotplug.refcount);  in try_get_online_cpus()
112 	mutex_unlock(&cpu_hotplug.lock);  in try_get_online_cpus()
121 	if (cpu_hotplug.active_writer == current)  in put_online_cpus()
124 	refcount = atomic_dec_return(&cpu_hotplug.refcount);  in put_online_cpus()
126 		atomic_inc(&cpu_hotplug.refcount);  in put_online_cpus()
128 	if (refcount <= 0 && waitqueue_active(&cpu_hotplug.wq))  in put_online_cpus()
129 		wake_up(&cpu_hotplug.wq);  in put_online_cpus()
162 	cpu_hotplug.active_writer = current;  in cpu_hotplug_begin()
166 		mutex_lock(&cpu_hotplug.lock);  in cpu_hotplug_begin()
167 		prepare_to_wait(&cpu_hotplug.wq, &wait, TASK_UNINTERRUPTIBLE);  in cpu_hotplug_begin()
168 		if (likely(!atomic_read(&cpu_hotplug.refcount)))  in cpu_hotplug_begin()
170 		mutex_unlock(&cpu_hotplug.lock);  in cpu_hotplug_begin()
173 	finish_wait(&cpu_hotplug.wq, &wait);  in cpu_hotplug_begin()
178 	cpu_hotplug.active_writer = NULL;  in cpu_hotplug_done()
179 	mutex_unlock(&cpu_hotplug.lock);  in cpu_hotplug_done()