CONFIG_HUGETLB_PAGE_SIZE_1M is not available for thedefaultarchitecture x86.
Result is shown for architecture metag
default or selected kernelversion does not have config value CONFIG_HUGETLB_PAGE_SIZE_1M.
Result is shown for kernelversion 6.7-rc3

1MB

configname: CONFIG_HUGETLB_PAGE_SIZE_1M

HugeTLB page size
└─>1MB
In linux kernel since version 3.1 (release Date: 2011-10-24)