Man pages matching name hugetlbfs_unlinked_fd_for_size in section 3:

hugetlbfs_unlinked_fd_for_size.3.en	debian 10 / libhugetlbfs-dev
hugetlbfs_unlinked_fd_for_size.3.en	debian 11 / libhugetlbfs-dev
hugetlbfs_unlinked_fd_for_size.3.en	debian 12 / libhugetlbfs-dev