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