log_tail           50 sys/kern/debug.c static u_long	log_tail;			/* iundex for log tail */
log_tail           80 sys/kern/debug.c 		log_buf[LOGINDEX(log_tail)] = c;
log_tail           81 sys/kern/debug.c 		log_tail++;
log_tail           85 sys/kern/debug.c 			log_head = log_tail - LOGBUFSZ;