diff -urN RC14-rc2-git8-uml-get_user/arch/ppc64/kernel/bpa_iommu.c RC14-rc2-git8-bpa_iommu/arch/ppc64/kernel/bpa_iommu.c
--- RC14-rc2-git8-uml-get_user/arch/ppc64/kernel/bpa_iommu.c	2005-08-28 23:09:40.000000000 -0400
+++ RC14-rc2-git8-bpa_iommu/arch/ppc64/kernel/bpa_iommu.c	2005-09-30 07:34:43.000000000 -0400
@@ -99,7 +99,11 @@
 		break;
 
 	default: /* not a known compile time constant */
-		BUILD_BUG_ON(1);
+		{
+			/* BUILD_BUG_ON() is not usable here */
+			extern void __get_iost_entry_bad_page_size(void);
+			__get_iost_entry_bad_page_size();
+		}
 		break;
 	}