CONFIG_PAGE_SIZE_LESS_THAN_256KB (not configurable)

configname: CONFIG_PAGE_SIZE_LESS_THAN_256KB

Linux Kernel Configuration
└─>General architecture-dependent options
└─>PAGE_SIZE_LESS_THAN_256KB
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  

is selected by
CONFIG_TEST_KMOD