CONFIG_MAPPING_DIRTY_HELPERS (not configurable)

modulename: mapping_dirty_helpers.ko

configname: CONFIG_MAPPING_DIRTY_HELPERS

Linux Kernel Configuration
└─>Memory Management options
└─>MAPPING_DIRTY_HELPERS
In linux kernel since version 5.1 (release Date: 2019-05-05)  
source code:
mm/mapping_dirty_helpers.c