--- zzzz-none-000/linux-4.9.279/drivers/mtd/ubi/wl.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/mtd/ubi/wl.c	2023-02-08 11:43:42.000000000 +0000
@@ -135,11 +135,18 @@
  */
 #define WL_MAX_FAILURES 32
 
+#ifdef CONFIG_MTD_UBI_DEBUG
 static int self_check_ec(struct ubi_device *ubi, int pnum, int ec);
 static int self_check_in_wl_tree(const struct ubi_device *ubi,
 				 struct ubi_wl_entry *e, struct rb_root *root);
 static int self_check_in_pq(const struct ubi_device *ubi,
 			    struct ubi_wl_entry *e);
+#else
+#define self_check_ec(ubi, pnum, ec) 0
+#define self_check_in_wl_tree(ubi, e, root)
+#define self_check_in_pq(ubi, e) 0
+#endif
+
 
 /**
  * wl_tree_add - add a wear-leveling entry to a WL RB-tree.
@@ -1782,6 +1789,8 @@
 	kfree(ubi->lookuptbl);
 }
 
+#ifdef CONFIG_MTD_UBI_DEBUG
+
 /**
  * self_check_ec - make sure that the erase counter of a PEB is correct.
  * @ubi: UBI device description object
@@ -1877,6 +1886,8 @@
 	dump_stack();
 	return -EINVAL;
 }
+#endif /* CONFIG_MTD_UBI_DEBUG */
+
 #ifndef CONFIG_MTD_UBI_FASTMAP
 static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)
 {