--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----
--- a/xen/include/asm-x86/x86_64/uaccess.h
+++ b/xen/include/asm-x86/x86_64/uaccess.h
@@ -34,7 +34,7 @@ 
  * non-canonical address (and thus fault) before ever reaching VIRT_START.
  */
 #define __addr_ok(addr) \
-    (((unsigned long)(addr) < (1UL<<48)) || \
+    (((unsigned long)(addr) < (1UL<<47)) || \
      ((unsigned long)(addr) >= HYPERVISOR_VIRT_END))
 #define access_ok(addr, size) \