CONFIG_HUGETLB_PAGE_SIZE_VARIABLE (not configurable)

configname: CONFIG_HUGETLB_PAGE_SIZE_VARIABLE

Linux Kernel Configuration
└─>Memory Management options
└─>HUGETLB_PAGE_SIZE_VARIABLE
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Allows the pageblock_order value to be dynamic instead of just standard
HUGETLB_PAGE_ORDER when there are multiple HugeTLB page sizes available
on a platform.

Note that the pageblock_order cannot exceed MAX_ORDER - 1 and will be
clamped down to MAX_ORDER - 1.