p4d_pfn 1293 arch/s390/include/asm/pgtable.h #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) p4d_pfn 923 arch/x86/include/asm/pgtable.h #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) p4d_pfn 394 arch/x86/mm/fault.c BUG_ON(p4d_pfn(*p4d) != p4d_pfn(*p4d_k));