N_PPP              91 drivers/net/ppp/ppp_async.c MODULE_ALIAS_LDISC(N_PPP);
N_PPP             392 drivers/net/ppp/ppp_async.c 	err = tty_register_ldisc(N_PPP, &ppp_ldisc);
N_PPP            1018 drivers/net/ppp/ppp_async.c 	if (tty_unregister_ldisc(N_PPP) != 0)