md_register_thread
md_register_thread(recover_bitmaps, mddev, "recover"));
md_register_thread(recv_daemon, mddev, "cluster_recv"));
md_register_thread(md_do_sync, mddev, name));
EXPORT_SYMBOL(md_register_thread);
extern struct md_thread *md_register_thread(
md_register_thread(raid1d, mddev, "raid1"));
md_register_thread(raid10d, mddev, "raid10"));
thread = md_register_thread(r5l_reclaim_thread, log->rdev->mddev,
md_register_thread(raid5d, mddev, pers_name));