btrfs: fix uninitialized variable warning in btrfs_sb_log_location

We only have 3 possible mirrors, and we have ASSERT()'s to make sure
we're not passing in an invalid super mirror into this function, so
technically this value isn't uninitialized.  However
-Wmaybe-uninitialized will complain, so set it to U64_MAX so if we don't
have ASSERT()'s turned on it'll error out later on when it see's the
zone is beyond our maximum zones.

Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 1f503e8..379d678 100644 (file)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -160,7 +160,7 @@ static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
  */
 static inline u32 sb_zone_number(int shift, int mirror)
 {
-       u64 zone;
+       u64 zone = U64_MAX;
 
        ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
        switch (mirror) {