ND6_SLOWTIMER_INTERVAL
callout_reset_bycpu(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
(nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,