default or selected kernelversion does not have config value CONFIG_GENERIC_CMPDI2.
Result is shown for kernelversion 6.4.14

CONFIG_GENERIC_CMPDI2 (not configurable)

modulename: cmpdi2.ko

configname: CONFIG_GENERIC_CMPDI2

Linux Kernel Configuration
└─>GENERIC_CMPDI2
In linux kernel since version 4.9.8 (release Date: 2017-02-04)  
source code:
lib/cmpdi2.c