CONFIG_DYNAMIC_MEMORY_LAYOUT (not configurable)

configname: CONFIG_DYNAMIC_MEMORY_LAYOUT

Linux Kernel Configuration
└─>Processor type and features
└─>DYNAMIC_MEMORY_LAYOUT
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This option makes base addresses of vmalloc and vmemmap as well as
__PAGE_OFFSET movable during boot.