179 et_start(struct eventtimer *et, sbintime_t first, sbintime_t period)  in et_start()  argument
184 	KASSERT(period >= 0, ("et_start: negative period"));  in et_start()
185 	KASSERT((et->et_flags & ET_FLAGS_PERIODIC) || period == 0,  in et_start()
187 	KASSERT((et->et_flags & ET_FLAGS_ONESHOT) || period != 0,  in et_start()
189 	if (period != 0) {  in et_start()
190 		if (period < et->et_min_period)  in et_start()
191 		        period = et->et_min_period;  in et_start()
192 		else if (period > et->et_max_period)  in et_start()
193 		        period = et->et_max_period;  in et_start()
195 	if (period == 0 || first != 0) {  in et_start()
201 	return (et->et_start(et, first, period));  in et_start()