65 } mem_hotplug = {  variable
67 	.lock = __MUTEX_INITIALIZER(mem_hotplug.lock),
75 #define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map)
76 #define memhp_lock_acquire()      lock_map_acquire(&mem_hotplug.dep_map)
77 #define memhp_lock_release()      lock_map_release(&mem_hotplug.dep_map)
82 	if (mem_hotplug.active_writer == current)  in get_online_mems()
85 	mutex_lock(&mem_hotplug.lock);  in get_online_mems()
86 	mem_hotplug.refcount++;  in get_online_mems()
87 	mutex_unlock(&mem_hotplug.lock);  in get_online_mems()
93 	if (mem_hotplug.active_writer == current)  in put_online_mems()
95 	mutex_lock(&mem_hotplug.lock);  in put_online_mems()
97 	if (WARN_ON(!mem_hotplug.refcount))  in put_online_mems()
98 		mem_hotplug.refcount++; /* try to fix things up */  in put_online_mems()
100 	if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer))  in put_online_mems()
101 		wake_up_process(mem_hotplug.active_writer);  in put_online_mems()
102 	mutex_unlock(&mem_hotplug.lock);  in put_online_mems()
109 	mem_hotplug.active_writer = current;  in mem_hotplug_begin()
113 		mutex_lock(&mem_hotplug.lock);  in mem_hotplug_begin()
114 		if (likely(!mem_hotplug.refcount))  in mem_hotplug_begin()
117 		mutex_unlock(&mem_hotplug.lock);  in mem_hotplug_begin()
124 	mem_hotplug.active_writer = NULL;  in mem_hotplug_done()
125 	mutex_unlock(&mem_hotplug.lock);  in mem_hotplug_done()