register_event
ret = register_event(&pdev->dev, PM_INIT_SUSPEND_CB, 0, 0, false,
ret = register_event(&pdev->dev, PM_NOTIFY_CB, node_id, EVENT_SUBSYSTEM_RESTART,
event->register_event = mem_cgroup_usage_register_event;
event->register_event = mem_cgroup_oom_register_event;
event->register_event = vmpressure_register_event;
event->register_event = memsw_cgroup_usage_register_event;
ret = event->register_event(memcg, event->eventfd, buf);
int (*register_event)(struct mem_cgroup *memcg,