__ARCH_HAS_NO_PAGE_ZERO_MAPPED  392 arch/m68k/include/asm/io_mm.h #define __ARCH_HAS_NO_PAGE_ZERO_MAPPED		1
__ARCH_HAS_NO_PAGE_ZERO_MAPPED  152 arch/sparc/include/asm/io_32.h #define __ARCH_HAS_NO_PAGE_ZERO_MAPPED		1