CONFIG_HUGETLB_PAGE

Why the system throws a "unknow key" error when try to set vm.nr_hugepages?Why the system throws a "unknow key" error when try to set vm.nr_hugepages?
RHEL8 RHEL7 RHEL5 CONFIG_HUGETLBFS CONFIG_HUGETLB_PAGE HugePages hugepage
07-05