Are you sure it's padding the unions, and not just treating the unions as structs? What is the size of this union? union a { int x; short y; }; regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-metag" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html