CONFIG_MMU_COLDFIRE is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

CONFIG_MMU_COLDFIRE (not configurable)

modulename: kmap.ko

configname: CONFIG_MMU_COLDFIRE

Linux Kernel Configuration
└─>MMU_COLDFIRE
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/m68k/mm/