alloc_unr
unit = alloc_unr(ucom_unrhdr);
obj->map_list.key = alloc_unr(mm->idxunr);
sc->unit = alloc_unr(backlight_unit);
sc->unit = alloc_unr(led_unit);
in->in_station = alloc_unr(sc->sc_unr);
sg->id = alloc_unr(pcmsg_unrhdr);
i = alloc_unr(uh);
priv->unit = alloc_unr(ngd_unit);
int alloc_unr(struct unrhdr *uh);