_PAGE_SILENT_READ
#define __READABLE (_PAGE_SILENT_READ | _PAGE_ACCESSED)
pte.pte_low &= ~_PAGE_SILENT_READ;
pte.pte_high &= ~_PAGE_SILENT_READ;
pte.pte_low |= _PAGE_SILENT_READ;
pte.pte_high |= _PAGE_SILENT_READ;
pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
pte_val(pte) |= _PAGE_SILENT_READ;
pte_val(pte) |= _PAGE_SILENT_READ;
pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
pmd_val(pmd) |= _PAGE_SILENT_READ;