--- Gnu-Mach/linux/src/include/asm-i386/segment.h	2020/09/02 04:46:04	1.1.1.2
+++ Gnu-Mach/linux/src/include/asm-i386/segment.h	2020/09/02 04:50:48	1.1.1.3
@@ -60,7 +60,11 @@ static inline void __attribute__((always
 				:"ir" (x), "m" (*__sd(y)));
 			break;
 		default:
+#ifdef __OPTIMIZE__
 			bad_user_access_length();
+#else
+			asm volatile("ud2");
+#endif
 	}
 }
 
@@ -85,7 +89,11 @@ static inline unsigned long __attribute_
 				:"m" (*__const_sd(y)));
 			return result;
 		default:
+#ifdef __OPTIMIZE__
 			return bad_user_access_length();
+#else
+			asm volatile("ud2");
+#endif
 	}
 }