+#undef CONFIG_RCU_SMP
+
+/* Compatibility mode for i386 which lacks cmpxchg instruction. */
+#undef CONFIG_RCU_COMPAT_ARCH
+
+/* Use the dmb instruction is available for use on ARM. */
+#undef CONFIG_RCU_ARM_HAVE_DMB
+
+/* TLS provided by the compiler. */
+#undef CONFIG_RCU_TLS