v4.19.13 snapshot.
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
new file mode 100644
index 0000000..57ab401
--- /dev/null
+++ b/arch/s390/lib/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for s390-specific library files..
+#
+
+lib-y += delay.o string.o uaccess.o find.o
+obj-y += mem.o xor.o
+lib-$(CONFIG_SMP) += spinlock.o
+lib-$(CONFIG_KPROBES) += probes.o
+lib-$(CONFIG_UPROBES) += probes.o
+
+chkbss := mem.o
+include $(srctree)/arch/s390/scripts/Makefile.chkbss