linux-kernel - Re: [PATCH 1/1 net-next] libceph: remove unused variable in handle

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Message-ID: <1805780944.182558.1414228336940.open-xchange@webmail.nmp.skynet.be>
Date:	Sat, 25 Oct 2014 11:12:16 +0200 (CEST)
From:	Fabian Frederick <fabf@...net.be>
To:	Ilya Dryomov <ilya.dryomov@...tank.com>
Cc:	netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ceph Development <ceph-devel@...r.kernel.org>,
	Sage Weil <sage@...tank.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/1 net-next] libceph: remove unused variable in
 handle_reply()



> On 23 October 2014 at 18:25 Ilya Dryomov <ilya.dryomov@...tank.com> wrote:
>
>
> On Thu, Oct 23, 2014 at 8:15 PM, Fabian Frederick <fabf@...net.be> wrote:
> > osdmap_epoch is redundant with reassert_epoch and unused.
> >
> > Signed-off-by: Fabian Frederick <fabf@...net.be>
> > ---
> >  net/ceph/osd_client.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
> > index f3fc54e..432bd75 100644
> > --- a/net/ceph/osd_client.c
> > +++ b/net/ceph/osd_client.c
> > @@ -1700,7 +1700,6 @@ static void handle_reply(struct ceph_osd_client *osdc,
> > struct ceph_msg *msg,
> >         int err;
> >         u32 reassert_epoch;
> >         u64 reassert_version;
> > -       u32 osdmap_epoch;
> >         int already_completed;
> >         u32 bytes;
> >         unsigned int i;
> > @@ -1725,7 +1724,6 @@ static void handle_reply(struct ceph_osd_client *osdc,
> > struct ceph_msg *msg,
> >         result = ceph_decode_32(&p);
> >         reassert_epoch = ceph_decode_32(&p);
> >         reassert_version = ceph_decode_64(&p);
> > -       osdmap_epoch = ceph_decode_32(&p);
> >
> >         /* lookup */
> >         down_read(&osdc->map_sem);
>
> Hi Fabian,
>
> osdmap_epoch is useful for debugging, but this is wrong anyway -
> ceph_decode_32() has side effects.  Removing it and not adjusting *p
> would make the whole thing blow up pretty fast..
>
> Thanks,
>
>                 Ilya

Hi Ilya,

        osdmap_epoch generates a warning with -Wunused-but-set-variable.
Maybe we could just do ceph_decode_32(&p) and remove it
(it doesn't seem to add a warning) and/or add some comment ?

Regards,
Fabian
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