From: Genjian Zhang <zhanggenjian@xxxxxxxxxx>
commit 8ba7d5f5ba931be68a94b8c91bcced1622934e7a upstream.
There are some warnings on older compilers (gcc 10, 7) or non-x86_64
architectures (aarch64). As btrfs wants to enable -Wmaybe-uninitialized
by default, fix the warnings even though it's not necessary on recent
compilers (gcc 12+).
../fs/btrfs/volumes.c: In function ‘btrfs_init_new_device’:
../fs/btrfs/volumes.c:2703:3: error: ‘seed_devices’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
2703 | btrfs_setup_sprout(fs_info, seed_devices);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../fs/btrfs/send.c: In function ‘get_cur_inode_state’:
../include/linux/compiler.h:70:32: error: ‘right_gen’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
70 | (__if_trace.miss_hit[1]++,1) : \
| ^
../fs/btrfs/send.c:1878:6: note: ‘right_gen’ was declared here
1878 | u64 right_gen;
| ^~~~~~~~~
Reported-by: k2ci <kernel-bot@xxxxxxxxxx>
Signed-off-by: Genjian Zhang <zhanggenjian@xxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Cc: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/send.c | 2 +-
fs/btrfs/volumes.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1658,7 +1658,7 @@ static int get_cur_inode_state(struct se
int left_ret;
int right_ret;
u64 left_gen;
- u64 right_gen;
+ u64 right_gen = 0;
struct btrfs_inode_info info;
ret = get_inode_info(sctx->send_root, ino, &info);
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2631,7 +2631,7 @@ int btrfs_init_new_device(struct btrfs_f
struct super_block *sb = fs_info->sb;
struct rcu_string *name;
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
- struct btrfs_fs_devices *seed_devices;
+ struct btrfs_fs_devices *seed_devices = NULL;
u64 orig_super_total_bytes;
u64 orig_super_num_devices;
int ret = 0;
