--- zzzz-none-000/linux-4.9.279/drivers/mtd/ubi/attach.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/mtd/ubi/attach.c	2023-02-08 11:43:42.000000000 +0000
@@ -89,7 +89,11 @@
 #include <linux/random.h>
 #include "ubi.h"
 
+#ifdef CONFIG_MTD_UBI_DEBUG
 static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai);
+#else
+#define  self_check_ai(ubi, ai) 0
+#endif
 
 #define AV_FIND		BIT(0)
 #define AV_ADD		BIT(1)
@@ -1659,6 +1663,7 @@
 	return err;
 }
 
+#ifdef CONFIG_MTD_UBI_DEBUG
 /**
  * self_check_ai - check the attaching information.
  * @ubi: UBI device description object
@@ -1933,3 +1938,4 @@
 	dump_stack();
 	return -EINVAL;
 }
+#endif /* CONFIG_MTD_UBI_DEBUG */