pgd_pfn          1294 arch/s390/include/asm/pgtable.h #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
pgd_pfn           964 arch/x86/include/asm/pgtable.h #define pgd_page(pgd)	pfn_to_page(pgd_pfn(pgd))