ref_pfn 944 arch/x86/mm/pageattr.c unsigned long lpaddr, lpinc, ref_pfn, pfn, pfninc = 1; ref_pfn 971 arch/x86/mm/pageattr.c ref_pfn = pmd_pfn(*(pmd_t *)kpte); ref_pfn 978 arch/x86/mm/pageattr.c ref_pfn = pud_pfn(*(pud_t *)kpte); ref_pfn 1001 arch/x86/mm/pageattr.c pfn = ref_pfn;