[PATCH] ppc64: fix non-SMP build break

arch/ppc64/lib/locks.c was recently added by Paulus' lock rewrite. It's
always compiled, which breaks non-SMP builds. Below patch makes it depend
on CONFIG_SMP.

arch/ppc64/lib/Makefile

@@ -3,4 +3,9 @@
 #
 
 lib-y := checksum.o dec_and_lock.o string.o strcase.o
-lib-y += copypage.o memcpy.o copyuser.o locks.o
+lib-y += copypage.o memcpy.o copyuser.o
+
+# Lock primitives are defined as no-ops in include/linux/spinlock.h
+# for non-SMP configs. Don't build the real versions.
+
+lib-$(CONFIG_SMP) += locks.o