_PAGE_BIT_RW       26 include/asm-x86/pgtable.h #define _PAGE_RW	(_AT(pteval_t, 1) << _PAGE_BIT_RW)
_PAGE_BIT_RW      533 include/asm-x86/pgtable.h 	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);