btrfs: silence maybe-uninitialized warning in clone_range
GCC throws warning message as below:
‘clone_src_i_size’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
^
fs/btrfs/send.c:5088:6: note: ‘clone_src_i_size’ was declared here
u64 clone_src_i_size;
^
The clone_src_i_size is only used as call-by-reference
in a call to get_inode_info().
Silence the warning by initializing clone_src_i_size to 0.
Note that the warning is a false positive and reported by older versions
of GCC (eg. 7.x) but not eg 9.x. As there have been numerous people, the
patch is applied. Setting clone_src_i_size to 0 does not otherwise make
sense and would not do any action in case the code changes in the future.
Signed-off-by: Austin Kim <austindh.kim@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add note ]
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index f321502..123ac54 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -5085,7 +5085,7 @@ static int clone_range(struct send_ctx *sctx,
struct btrfs_path *path;
struct btrfs_key key;
int ret;
- u64 clone_src_i_size;
+ u64 clone_src_i_size = 0;
/*
* Prevent cloning from a zero offset with a length matching the sector
