CRC32/CRC32c functions

modulename: crc32.ko

configname: CONFIG_CRC32

Linux Kernel Configuration
└─>Library routines
└─>CRC32/CRC32c functions
In linux kernel since version 2.6.12  
This option is provided for the case where no in-kernel-tree
modules require CRC32/CRC32c functions, but a module built outside
the kernel tree does. Such modules that use library CRC32/CRC32c
functions require M here.

source code:
lib/crc32.c