--- lib/Makefile
+++ lib/Makefile
@@ -113,6 +113,9 @@ obj-$(CONFIG_AVERAGE) += average.o
obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
+obj-$(CONFIG_GENERIC_STRNCPY_FROM_USER) += strncpy_from_user.o
+obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o
+
hostprogs-y := gen_crc32table
clean-files := crc32table.h