diff --git a/arch/parisc/include/asm/mmzone.h b/arch/parisc/include/asm/mmzone.h
index 9608d2c..dbddcac 100644
--- a/arch/parisc/include/asm/mmzone.h
+++ b/arch/parisc/include/asm/mmzone.h
@@ -35,12 +35,8 @@ extern struct node_map_data node_data[];
 #define PFNNID_MAP_MAX  512     /* support 512GB */
 extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
 
-#ifndef CONFIG_64BIT
-#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
-#else
 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
-#endif
 
 static inline int pfn_to_nid(unsigned long pfn)
 {