--- a/Makefile	2009-03-23 21:50:02.000000000 -0400
+++ b/Makefile	2009-03-23 21:52:02.000000000 -0400
@@ -555,6 +555,9 @@ KBUILD_CFLAGS += $(call cc-option,-Wdecl
 # disable pointer signed / unsigned warnings in gcc 4.0
 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 
+# disable invalid "can't wrap" optimzations for signed / pointers
+KBUILD_CFLAGS	+= $(call cc-option,-fwrapv)
+
 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 # But warn user when we do so
 warn-assign = \