crc_ccitt_byte 99 include/linux/ppp_defs.h #define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c) crc_ccitt_byte 24 include/net/irda/crc.h #define irda_fcs(fcs, c) crc_ccitt_byte(fcs, c) crc_ccitt_byte 63 lib/crc-ccitt.c crc = crc_ccitt_byte(crc, *buffer++);