diff -rN -u -p old-xen-build2/linux-2.6-xen-sparse/include/asm-xen/asm-i386/setup.h new-xen-build2/linux-2.6-xen-sparse/include/asm-xen/asm-i386/setup.h
--- old-xen-build2/linux-2.6-xen-sparse/include/asm-xen/asm-i386/setup.h	2005-10-04 19:08:26.000000000 +0000
+++ new-xen-build2/linux-2.6-xen-sparse/include/asm-xen/asm-i386/setup.h	2005-10-14 18:59:42.000000000 +0000
@@ -8,7 +8,7 @@
 
 #define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 #define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
+#define PFN_PHYS(x)	((unsigned long long)(x) << PAGE_SHIFT)
 
 /*
  * Reserved space for vmalloc and iomap - defined in asm/page.h