DZ_XMIT_SIZE      286 drivers/tty/serial/dz.c 	xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
DZ_XMIT_SIZE      128 drivers/tty/serial/dz.h #define DZ_WAKEUP_CHARS   DZ_XMIT_SIZE/4