From: Arnd Bergmann <arnd@xxxxxxxx>
commit 6c64460cdc8be5fa074aa8fe2ae8736d5792bdc5 upstream.
gcc sometimes can't determine whether a variable has been initialized
when both the initialization and the use are conditional:
fs/btrfs/props.c: In function 'inherit_props':
fs/btrfs/props.c:389:4: error: 'num_bytes' may be used uninitialized in this function [-Werror=maybe-uninitialized]
btrfs_block_rsv_release(fs_info, trans->block_rsv,
This code is fine. Unfortunately, I cannot think of a good way to
rephrase it in a way that makes gcc understand this, so I add a bogus
initialization the way one should not.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
[ gcc 8 and 9 don't emit the warning ]
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/props.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -337,7 +337,7 @@ static int inherit_props(struct btrfs_tr
for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
const struct prop_handler *h = &prop_handlers[i];
const char *value;
- u64 num_bytes;
+ u64 num_bytes = 0;
if (!h->inheritable)
continue;
