| Message ID | 20240820233132.24652-1-dsterba@suse.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | btrfs: initialize last_extent_end to fix -Wmaybe-uninitialized warning in extent_fiemap() | expand |
On Wed, Aug 21, 2024 at 01:31:32AM +0200, David Sterba wrote: > There's a warning (probably on some older compiler version): > > fs/btrfs/fiemap.c: warning: 'last_extent_end' may be used uninitialized in this function [-Wmaybe-uninitialized]: => 822:19 > > Initialize the variable to 0 although it's not necessary as it's either > properly set or not used after an error. The called function is in the > same file so this is a false alert but we want to fix all > -Wmaybe-uninitialized reports. > > Link: https://lore.kernel.org/all/20240819070639.2558629-1-geert@linux-m68k.org/ > Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> > Signed-off-by: David Sterba <dsterba@suse.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Thanks, Josef
diff --git a/fs/btrfs/fiemap.c b/fs/btrfs/fiemap.c index 8f95f3e44e99..df7f09f3b02e 100644 --- a/fs/btrfs/fiemap.c +++ b/fs/btrfs/fiemap.c @@ -637,7 +637,7 @@ static int extent_fiemap(struct btrfs_inode *inode, struct btrfs_path *path; struct fiemap_cache cache = { 0 }; struct btrfs_backref_share_check_ctx *backref_ctx; - u64 last_extent_end; + u64 last_extent_end = 0; u64 prev_extent_end; u64 range_start; u64 range_end;
There's a warning (probably on some older compiler version): fs/btrfs/fiemap.c: warning: 'last_extent_end' may be used uninitialized in this function [-Wmaybe-uninitialized]: => 822:19 Initialize the variable to 0 although it's not necessary as it's either properly set or not used after an error. The called function is in the same file so this is a false alert but we want to fix all -Wmaybe-uninitialized reports. Link: https://lore.kernel.org/all/20240819070639.2558629-1-geert@linux-m68k.org/ Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: David Sterba <dsterba@suse.com> --- fs/btrfs/fiemap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)