PHYSICAL_PMD_PAGE_MASK 578 arch/x86/include/asm/pgtable.h pfn &= PHYSICAL_PMD_PAGE_MASK; PHYSICAL_PMD_PAGE_MASK 624 arch/x86/include/asm/pgtable.h val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK); PHYSICAL_PMD_PAGE_MASK 422 arch/x86/include/asm/pgtable_types.h return PHYSICAL_PMD_PAGE_MASK;