tag	line	file	source code
FASYNC_MAGIC	1231	drivers/char/tty_io.c	fa->magic = FASYNC_MAGIC;
FASYNC_MAGIC	177	fs/fcntl.c	if (fa->magic != FASYNC_MAGIC) {
FASYNC_MAGIC	475	net/socket.c	fna->magic=FASYNC_MAGIC;