From: Genjian Zhang zhanggenjian@kylinos.cn
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@kylinos.cn Signed-off-by: Genjian Zhang zhanggenjian@kylinos.cn Reviewed-by: David Sterba dsterba@suse.com [ update changelog ] Signed-off-by: David Sterba dsterba@suse.com Cc: Ammar Faizi ammarfaizi2@gnuweeb.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -1875,7 +1875,7 @@ 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 @@ -2618,7 +2618,7 @@ int btrfs_init_new_device(struct btrfs_f struct block_device *bdev; struct super_block *sb = fs_info->sb; 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;