167 	unsigned int c, p, bytes1 = 0, bytes2 = 0;  in evtchn_read()  local
204 		bytes1 = (EVTCHN_RING_SIZE - EVTCHN_RING_MASK(c)) *  in evtchn_read()
208 		bytes1 = (p - c) * sizeof(evtchn_port_t);  in evtchn_read()
213 	if (bytes1 > count) {  in evtchn_read()
214 		bytes1 = count;  in evtchn_read()
216 	} else if ((bytes1 + bytes2) > count) {  in evtchn_read()
217 		bytes2 = count - bytes1;  in evtchn_read()
222 	if (copy_to_user(buf, &u->ring[EVTCHN_RING_MASK(c)], bytes1) ||  in evtchn_read()
224 	     copy_to_user(&buf[bytes1], &u->ring[0], bytes2)))  in evtchn_read()
227 	u->ring_cons += (bytes1 + bytes2) / sizeof(evtchn_port_t);  in evtchn_read()
228 	rc = bytes1 + bytes2;  in evtchn_read()