CRC4 functions

modulename: crc4.ko

configname: CONFIG_CRC4

Linux Kernel Configuration
└─>Library routines
└─>CRC4 functions
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This option is provided for the case where no in-kernel-tree
modules require CRC4 functions, but a module built outside
the kernel tree does. Such modules that use library CRC4
functions require M here.

source code: