_PMD_PAGE_8M
if (pmd_val(pmd) & _PMD_PAGE_8M)
else if ((pmd_val(*pmd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M)
*pmd = __pmd(pmd_val(*pmd) | _PMD_PAGE_8M);
*pmdp = __pmd(pmd_val(*pmdp) | _PMD_PAGE_8M);
*(pmdp + 1) = __pmd(pmd_val(*(pmdp + 1)) | _PMD_PAGE_8M);