tag	line	file	source code
PARENB	1378	drivers/char/cyclades.c	if (cflag & PARENB){
PARENB	1154	drivers/char/serial.c	if (cflag & PARENB)
PARENB	157	include/linux/tty.h	#define C_PARENB(tty)  _C_FLAG((tty),PARENB)