--- zzzz-none-000/linux-4.9.279/drivers/mtd/ubi/debug.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/mtd/ubi/debug.c	2023-02-08 11:43:42.000000000 +0000
@@ -100,6 +100,7 @@
 		       vid_hdr, UBI_VID_HDR_SIZE, 1);
 }
 
+#ifdef CONFIG_MTD_UBI_DEBUG
 /**
  * ubi_dump_vol_info - dump volume information.
  * @vol: UBI volume description object
@@ -544,3 +545,4 @@
 	ubi_ro_mode(ubi);
 	return 1;
 }
+#endif /* CONFIG_MTD_UBI_DEBUG */