The compilation with W=1 generates the following warnings:
fs/btrfs/sysfs.c:1630:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
1630 | int ret;
| ^~~
fs/btrfs/sysfs.c:1629:6: warning: variable 'features' set but not used [-Wunused-but-set-variable]
1629 | u64 features;
| ^~~~~~~~
[ The unused variables are leftover from
e410e34fad91 ("Revert "btrfs:
synchronize incompat feature bits with sysfs files""), which needs
to be properly fixed by moving feature bit manipulation from the sysfs
context. Silence the warning to save pepople time, we got several
reports. ]
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
{
struct btrfs_fs_devices *fs_devs;
struct kobject *fsid_kobj;
- u64 features;
- int ret;
+ u64 __maybe_unused features;
+ int __maybe_unused ret;
if (!fs_info)
return;
+ /*
+ * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not
+ * safe when called from some contexts (eg. balance)
+ */
features = get_features(fs_info, set);
ASSERT(bit & supported_feature_masks[set]);