--- zzzz-none-000/linux-4.9.279/drivers/mtd/ubi/vtbl.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/mtd/ubi/vtbl.c	2023-02-08 11:43:42.000000000 +0000
@@ -64,7 +64,12 @@
 #include <asm/div64.h>
 #include "ubi.h"
 
+#ifdef CONFIG_MTD_UBI_DEBUG
 static void self_vtbl_check(const struct ubi_device *ubi);
+#else
+#define self_vtbl_check(ubi)
+#define ubi_dump_av(av)
+#endif
 
 /* Empty volume table record */
 static struct ubi_vtbl_record empty_vtbl_record;
@@ -855,6 +860,8 @@
 	return err;
 }
 
+#ifdef CONFIG_MTD_UBI_DEBUG
+
 /**
  * self_vtbl_check - check volume table.
  * @ubi: UBI device description object
@@ -869,3 +876,5 @@
 		BUG();
 	}
 }
+
+#endif