HUGETLB_PAGE_ORDER   46 include/linux/pageblock-flags.h #define pageblock_order		HUGETLB_PAGE_ORDER
HUGETLB_PAGE_ORDER 1301 mm/hugetlb.c   			hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
HUGETLB_PAGE_ORDER 3361 mm/page_alloc.c 		return HUGETLB_PAGE_ORDER;