CONFIG_CRC_CCITT (not configurable)

modulename: crc-ccitt.ko

configname: CONFIG_CRC_CCITT

Linux Kernel Configuration
└─>Library routines
└─>CRC_CCITT
In linux kernel since version 2.6.12  
The CRC-CCITT library functions. Select this if your module uses any
of the functions from <linux/crc-ccitt.h>.

source code:
lib/crc-ccitt.c