--- zzzz-none-000/linux-3.10.107/drivers/md/persistent-data/dm-btree-internal.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/md/persistent-data/dm-btree-internal.h	2021-02-04 17:41:59.000000000 +0000
@@ -52,7 +52,7 @@
 		  struct dm_btree_value_type *vt);
 
 int new_block(struct dm_btree_info *info, struct dm_block **result);
-int unlock_block(struct dm_btree_info *info, struct dm_block *b);
+void unlock_block(struct dm_btree_info *info, struct dm_block *b);
 
 /*
  * Spines keep track of the rolling locks.  There are 2 variants, read-only