_NULL_PMD 200 arch/hexagon/include/asm/pgtable.h pmd_val(*pmd_entry_ptr) = _NULL_PMD; _NULL_PMD 247 arch/hexagon/include/asm/pgtable.h return pmd_val(pmd) == _NULL_PMD; _NULL_PMD 258 arch/hexagon/include/asm/pgtable.h return pmd_val(pmd) != (unsigned long)_NULL_PMD;