alloc_hugetlb_folio
folio = alloc_hugetlb_folio(&pseudo_vma, addr, false);
struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
new_folio = alloc_hugetlb_folio(dst_vma, addr, false);
new_folio = alloc_hugetlb_folio(vma, vmf->address, cow_from_owner);
folio = alloc_hugetlb_folio(vma, vmf->address, false);
folio = alloc_hugetlb_folio(dst_vma, dst_addr, false);
folio = alloc_hugetlb_folio(dst_vma, dst_addr, false);