btrfs: fix uninitialized variable warning in btrfs_cleanup_ordered_extents

We can conditionally pass in a locked page, and then we'll use that page
range to skip marking errors as that will happen in another layer.
However this causes the compiler to complain because it doesn't
understand we only use these values when we have the page.  Make the
compiler stop complaining by setting these values to 0.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.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/inode.c b/fs/btrfs/inode.c
index 98a800b8bd438b53e1ef21647bd6ebe95d385256..77c2acc06891f8e519afff41bf80d05e80136d8f 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -228,7 +228,7 @@ static inline void btrfs_cleanup_ordered_extents(struct btrfs_inode *inode,
 {
        unsigned long index = offset >> PAGE_SHIFT;
        unsigned long end_index = (offset + bytes - 1) >> PAGE_SHIFT;
-       u64 page_start, page_end;
+       u64 page_start = 0, page_end = 0;
        struct page *page;
 
        if (locked_page) {