#define pmd_none(pmd_entry) (pmd_val((pmd_entry)) == _PMD_EMPTY)
#define pmd_bad(pmd_entry) ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define pmd_none(pmd_entry) (pmd_val((pmd_entry)) == _PMD_EMPTY)
#define pmd_bad(pmd_entry) ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)