new_unrhdr
ucom_unrhdr = new_unrhdr(0, UCOM_UNIT_MAX - 1, NULL);
mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL);
backlight_unit = new_unrhdr(0, INT_MAX, NULL);
led_unit = new_unrhdr(0, INT_MAX, NULL);
sc->sc_unr = new_unrhdr(1, IWI_MAX_IBSSNODE-1, &sc->sc_mtx);
pcmsg_unrhdr = new_unrhdr(1, INT_MAX, NULL);
uh = new_unrhdr(0, NN - 1, NULL);
ngd_unit = new_unrhdr(0, MAX_NGD, NULL);
struct unrhdr *new_unrhdr(int low, int high, struct lock *lock);