huge_pmd_share
ptep = huge_pmd_share(mm, vma, addr, pudp);
pte = huge_pmd_share(mm, vma, addr, pud);
pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
pte = huge_pmd_share(mm, vma, addr, pud);