[PATCH v2 0/5] btrfs: fix compiler warning with make W=1

[Johannes Thumshirn <jthumshirn@suse.de>]

This patchset fixes most of the compiler warnings encountered when building
btrfs with make W=1.

There are two more compiler warnings left in raid56.c:
  CC [M]  fs/btrfs/raid56.o
fs/btrfs/raid56.c: In function ‘finish_rmw’:
fs/btrfs/raid56.c:1185:6: warning: variable ‘p_stripe’ set but not used [-Wunused-but-set-variable]
  int p_stripe = -1;
      ^
fs/btrfs/raid56.c: In function ‘finish_parity_scrub’:
fs/btrfs/raid56.c:2343:6: warning: variable ‘p_stripe’ set but not used [-Wunused-but-set-variable]
  int p_stripe = -1;
      ^
but I'm currently unsure how an appropriate fix would look like. As far as I
can tell these variables have always been unused since they have been
introduced.

There are still warnings left emitted by kernel-doc but these are subject to
another patchset, this one only addresses the warnings generated by gcc.

Changes to v1:
* Added Reviews
* Dropped already applied patches 4 + 5
* Added EXPORT_FOR_TESTS + users

Johannes Thumshirn (5):
  btrfs: remove unused drop_on_err in btrfs_mkdir()
  btrfs: remove set but not used variable err in btrfs_add_link
  btrfs: remove unused function btrfs_sysfs_feature_update()
  btrfs: introduce EXPORT_FOR_TESTS macro
  btrfs: use EXPORT_FOR_TESTS for conditionally shared functions

 fs/btrfs/ctree.h                 |  6 ++++++
 fs/btrfs/extent_io.c             | 14 ++------------
 fs/btrfs/extent_io.h             |  7 +++----
 fs/btrfs/free-space-tree.c       |  8 ++++++--
 fs/btrfs/inode.c                 | 16 ++++++----------
 fs/btrfs/sysfs.c                 | 33 ---------------------------------
 fs/btrfs/sysfs.h                 |  2 --
 fs/btrfs/tests/extent-io-tests.c | 10 +++++-----
 8 files changed, 28 insertions(+), 68 deletions(-)

-- 
2.16.4