[PATCH] nfs: flexfilelayout: fix unused-but-set variable 'err'

[PATCH] nfs: flexfilelayout: fix unused-but-set variable 'err'

[Kenner de Azevedo dos Santos Miranda]

The variable int err in f_layout_io_track_ds_error() is set but not used in the code.

The warning was identified by running make w=1:

   warning: variable ‘err’ set but not used

I set the (void)err to prevent the warning.

I didn`t test with hardware, i ran again the make w=1 and the warning was removed.

Signed-off-by: Kenner de Azevedo dos Santos Miranda <kenner.linuxdev@gmail.com>
---
 fs/nfs/flexfilelayout/flexfilelayout.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 8b1559171fe3..d9a0fed41eac 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -1536,6 +1536,7 @@ static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
 				       mirror, dss_id, offset, length, status, opnum,
 				       nfs_io_gfp_mask());
 
+	(void)err;
 	switch (status) {
 	case NFS4ERR_DELAY:
 	case NFS4ERR_GRACE:
-- 
2.43.0

Re: [PATCH] nfs: flexfilelayout: fix unused-but-set variable 'err'

[Anna Schumaker]

Hi Kenner,

On Tue, Apr 28, 2026, at 3:59 PM, Kenner de Azevedo dos Santos Miranda wrote:
> The variable int err in f_layout_io_track_ds_error() is set but not 
> used in the code.
>
> The warning was identified by running make w=1:
>
>    warning: variable ‘err’ set but not used
>
> I set the (void)err to prevent the warning.

Wouldn't it be better to handle the error instead of ignoring it?

Thanks,
Anna

>
> I didn`t test with hardware, i ran again the make w=1 and the warning 
> was removed.
>
> Signed-off-by: Kenner de Azevedo dos Santos Miranda <kenner.linuxdev@gmail.com>
> ---
>  fs/nfs/flexfilelayout/flexfilelayout.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c 
> b/fs/nfs/flexfilelayout/flexfilelayout.c
> index 8b1559171fe3..d9a0fed41eac 100644
> --- a/fs/nfs/flexfilelayout/flexfilelayout.c
> +++ b/fs/nfs/flexfilelayout/flexfilelayout.c
> @@ -1536,6 +1536,7 @@ static void ff_layout_io_track_ds_error(struct 
> pnfs_layout_segment *lseg,
>  				       mirror, dss_id, offset, length, status, opnum,
>  				       nfs_io_gfp_mask());
> 
> +	(void)err;
>  	switch (status) {
>  	case NFS4ERR_DELAY:
>  	case NFS4ERR_GRACE:
> -- 
> 2.43.0

Re: [PATCH] nfs: flexfilelayout: fix unused-but-set variable 'err'

[kenner azevedi]

Hi Anna, sure!

The error message is being used as information. If I replace dprintk
with pr_debug("%s: err %d op %d status %u\n", __func__, err, opnum,
status); I am telling the compiler that the variable is being used.
Fixing the warning.

Is this change reasonable?

Regards,

Kenner Azevedo

On Wed, Apr 29, 2026 at 10:50 AM Anna Schumaker <anna@kernel.org> wrote:
>
> Hi Kenner,
>
> On Tue, Apr 28, 2026, at 3:59 PM, Kenner de Azevedo dos Santos Miranda wrote:
> > The variable int err in f_layout_io_track_ds_error() is set but not
> > used in the code.
> >
> > The warning was identified by running make w=1:
> >
> >    warning: variable ‘err’ set but not used
> >
> > I set the (void)err to prevent the warning.
>
> Wouldn't it be better to handle the error instead of ignoring it?
>
> Thanks,
> Anna
>
> >
> > I didn`t test with hardware, i ran again the make w=1 and the warning
> > was removed.
> >
> > Signed-off-by: Kenner de Azevedo dos Santos Miranda <kenner.linuxdev@gmail.com>
> > ---
> >  fs/nfs/flexfilelayout/flexfilelayout.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c
> > b/fs/nfs/flexfilelayout/flexfilelayout.c
> > index 8b1559171fe3..d9a0fed41eac 100644
> > --- a/fs/nfs/flexfilelayout/flexfilelayout.c
> > +++ b/fs/nfs/flexfilelayout/flexfilelayout.c
> > @@ -1536,6 +1536,7 @@ static void ff_layout_io_track_ds_error(struct
> > pnfs_layout_segment *lseg,
> >                                      mirror, dss_id, offset, length, status, opnum,
> >                                      nfs_io_gfp_mask());
> >
> > +     (void)err;
> >       switch (status) {
> >       case NFS4ERR_DELAY:
> >       case NFS4ERR_GRACE:
> > --
> > 2.43.0