tty_alloc_mutex
tp = ns->ns_part1.np_tty = tty_alloc_mutex(&nmdm_class, &ns->ns_part1,
tp = ns->ns_part2.np_tty = tty_alloc_mutex(&nmdm_class, &ns->ns_part2,
tp = tty_alloc_mutex(&sc_ttydevsw, stc, &Giant);
tp = tty_alloc_mutex(&ucom_class, sc, sc->sc_mtx);
port->vtcport_tty = tty_alloc_mutex(&vtcon_tty_class, port,
return (tty_alloc_mutex(tsw, sc, NULL));
struct tty *tty_alloc_mutex(struct ttydevsw *tsw, void *softc, struct mtx *mtx);