Index: boot/Makefile
===================================================================
--- boot/Makefile	(revision 41f7564e975bcef427a9a5bcbb0c12c9001f1a58)
+++ boot/Makefile	(revision 73a1fe5b91c30e933651a7a22af4e5e3b230a12e)
@@ -48,4 +48,8 @@
 endif
 
+ifeq ($(CONFIG_SMP),y)
+	DEFS += -DCONFIG_SMP
+endif
+
 .PHONY: all build config distclean clean generic_clean