tag	line	file	source code
write_data_ptr	236	include/linux/tty.h	unsigned char *write_data_ptr;
write_data_ptr	1515	kernel/chr_drv/tty_io.c	tty->write_data_ptr = (unsigned char *) p;
write_data_ptr	1553	kernel/chr_drv/tty_io.c	p = tty->write_data_ptr;
write_data_ptr	1561	kernel/chr_drv/tty_io.c	tty->write_data_ptr = p;