diff -drupN a/fs/Makefile b/fs/Makefile
--- a/fs/Makefile	2017-10-21 18:09:07.000000000 +0300
+++ b/fs/Makefile	2022-06-09 05:02:34.000000000 +0300
@@ -126,3 +126,4 @@ obj-y				+= exofs/ # Multiple modules
 obj-$(CONFIG_CEPH_FS)		+= ceph/
 obj-$(CONFIG_PSTORE)		+= pstore/
 obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
+obj-$(CONFIG_YAFFS_FS)		+= yaffs2/