Hi David,

After merging the btrfs-kdave tree, today's linux-next build (powerpc
ppc64_defconfig) produced this warning:

fs/btrfs/relocation.c: In function 'insert_dirty_subv':
fs/btrfs/relocation.c:2138:6: warning: unused variable 'root_objectid' [-Wunused-variable]
  u64 root_objectid = root->root_key.objectid;
      ^~~~~~~~~~~~~

Introduced by commit

  7b837199c581 ("btrfs: relocation: Delay reloc tree deletion after merge_reloc_roots()")

Presumably the ASSERT is compiled out in this configuration.

-- 
Cheers,
Stephen Rothwell