Signed-off-by: David Sterba <dsterba@suse.com>
 
        u64 highest_objectid;
 
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
        /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
        u64 alloc_bytenr;
+#endif
 
        u64 defrag_trans_start;
        struct btrfs_key defrag_progress;
 
        bool skinny_metadata = btrfs_fs_incompat(root->fs_info,
                                                 SKINNY_METADATA);
 
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
        if (btrfs_test_is_dummy_root(root)) {
                buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr,
                                            level);
                        root->alloc_bytenr += blocksize;
                return buf;
        }
+#endif
 
        block_rsv = use_block_rsv(trans, root, blocksize);
        if (IS_ERR(block_rsv))