--- linux-4.9.37/fs/Kconfig	2017-07-12 16:42:41.000000000 +0300
+++ linux-4.9.y/fs/Kconfig	2021-06-07 13:01:34.000000000 +0300
@@ -232,6 +232,7 @@
 source "fs/befs/Kconfig"
 source "fs/bfs/Kconfig"
 source "fs/efs/Kconfig"
+source "fs/yaffs2/Kconfig"
 source "fs/jffs2/Kconfig"
 # UBIFS File system configuration
 source "fs/ubifs/Kconfig"