diff --git a/include/asm-m68knommu/page.h b/include/asm-m68knommu/page.h
index 05e03df0ec29..ff6a9265ed1c 100644
--- a/include/asm-m68knommu/page.h
+++ b/include/asm-m68knommu/page.h
@@ -73,8 +73,8 @@ extern unsigned long memory_end;
 
 #ifndef __ASSEMBLY__
 
-#define __pa(vaddr)		virt_to_phys((void *)vaddr)
-#define __va(paddr)		phys_to_virt((unsigned long)paddr)
+#define __pa(vaddr)		virt_to_phys((void *)(vaddr))
+#define __va(paddr)		phys_to_virt((unsigned long)(paddr))
 
 #define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
@@ -84,6 +84,7 @@ extern unsigned long memory_end;
 
 #define pfn_to_page(pfn)	virt_to_page(pfn_to_virt(pfn))
 #define page_to_pfn(page)	virt_to_pfn(page_to_virt(page))
+#define pfn_valid(pfn)	        ((pfn) < max_mapnr)
 
 #define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
 				((void *)(kaddr) < (void *)memory_end))