clear_pmd_bit
pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_WRITE));
pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_DIRTY));
pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID));
pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG));
return clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY));
new = clear_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));