1278 static int kbd_head, kbd_tail;  variable
1295 	next = (kbd_head + 1) % KBD_QSIZE;  in push_kbd()
1297 		kbd_queue [kbd_head].id = scan & KBD_KEYMASK;  in push_kbd()
1298 		kbd_queue [kbd_head].value=scan & KBD_UP ? VKEY_UP : VKEY_DOWN;  in push_kbd()
1299 		kbd_queue [kbd_head].time = xtime;  in push_kbd()
1300 		kbd_head = next;  in push_kbd()
1316 	if (kbd_head == kbd_tail){  in kbd_read()
1322 		if (kbd_head == kbd_tail && !signal_pending(current)) {  in kbd_read()
1333 	for (; p < end && kbd_head != kbd_tail;){  in kbd_read()
1386 	if (kbd_head != kbd_tail)  in kbd_poll()
1502 		count = kbd_head - kbd_tail;  in kbd_ioctl()
1525 	kbd_head = kbd_tail = 0;  in kbd_open()