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.

Johannes Thumshirn (6):
  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: remove unused variable tree in bio_readpage_error()
  btrfs: remove unused variable tree in end_compressed_bio_write()
  btrfs: unconditionally provide function prototypes from
    free-space-tree.h

 fs/btrfs/compression.c     |  2 --
 fs/btrfs/extent_io.c       |  3 ---
 fs/btrfs/free-space-tree.h |  2 --
 fs/btrfs/inode.c           | 16 ++++++----------
 fs/btrfs/sysfs.c           | 33 ---------------------------------
 fs/btrfs/sysfs.h           |  2 --
 6 files changed, 6 insertions(+), 52 deletions(-)

-- 
2.16.4

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