_PAGE_BIT_DIRTY    42 arch/x86/include/asm/pgtable_types.h #define _PAGE_BIT_FILE		_PAGE_BIT_DIRTY
_PAGE_BIT_DIRTY    50 arch/x86/include/asm/pgtable_types.h #define _PAGE_DIRTY	(_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)