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Date:   Wed, 19 Aug 2020 09:39:14 +0200
From:   Ilya Dryomov <idryomov@...il.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Miaohe Lin <linmiaohe@...wei.com>,
        "David S. Miller" <davem@...emloft.net>, kuba@...nel.org,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Ceph Development <ceph-devel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libceph: Convert to use the preferred fallthrough macro

On Tue, Aug 18, 2020 at 9:56 PM Jeff Layton <jlayton@...nel.org> wrote:
>
> On Tue, 2020-08-18 at 08:26 -0400, Miaohe Lin wrote:
> > Convert the uses of fallthrough comments to fallthrough macro.
> >
> > Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> > ---
> >  net/ceph/ceph_hash.c    | 20 ++++++++++----------
> >  net/ceph/crush/mapper.c |  2 +-
> >  net/ceph/messenger.c    |  4 ++--
> >  net/ceph/mon_client.c   |  2 +-
> >  net/ceph/osd_client.c   |  4 ++--
> >  5 files changed, 16 insertions(+), 16 deletions(-)
> >
> > diff --git a/net/ceph/ceph_hash.c b/net/ceph/ceph_hash.c
> > index 81e1e006c540..16a47c0eef37 100644
> > --- a/net/ceph/ceph_hash.c
> > +++ b/net/ceph/ceph_hash.c
> > @@ -50,35 +50,35 @@ unsigned int ceph_str_hash_rjenkins(const char *str, unsigned int length)
> >       switch (len) {
> >       case 11:
> >               c = c + ((__u32)k[10] << 24);
> > -             /* fall through */
> > +             fallthrough;
> >       case 10:
> >               c = c + ((__u32)k[9] << 16);
> > -             /* fall through */
> > +             fallthrough;
> >       case 9:
> >               c = c + ((__u32)k[8] << 8);
> >               /* the first byte of c is reserved for the length */
> > -             /* fall through */
> > +             fallthrough;
> >       case 8:
> >               b = b + ((__u32)k[7] << 24);
> > -             /* fall through */
> > +             fallthrough;
> >       case 7:
> >               b = b + ((__u32)k[6] << 16);
> > -             /* fall through */
> > +             fallthrough;
> >       case 6:
> >               b = b + ((__u32)k[5] << 8);
> > -             /* fall through */
> > +             fallthrough;
> >       case 5:
> >               b = b + k[4];
> > -             /* fall through */
> > +             fallthrough;
> >       case 4:
> >               a = a + ((__u32)k[3] << 24);
> > -             /* fall through */
> > +             fallthrough;
> >       case 3:
> >               a = a + ((__u32)k[2] << 16);
> > -             /* fall through */
> > +             fallthrough;
> >       case 2:
> >               a = a + ((__u32)k[1] << 8);
> > -             /* fall through */
> > +             fallthrough;
> >       case 1:
> >               a = a + k[0];
> >               /* case 0: nothing left to add */
> > diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
> > index 07e5614eb3f1..7057f8db4f99 100644
> > --- a/net/ceph/crush/mapper.c
> > +++ b/net/ceph/crush/mapper.c
> > @@ -987,7 +987,7 @@ int crush_do_rule(const struct crush_map *map,
> >               case CRUSH_RULE_CHOOSELEAF_FIRSTN:
> >               case CRUSH_RULE_CHOOSE_FIRSTN:
> >                       firstn = 1;
> > -                     /* fall through */
> > +                     fallthrough;
> >               case CRUSH_RULE_CHOOSELEAF_INDEP:
> >               case CRUSH_RULE_CHOOSE_INDEP:
> >                       if (wsize == 0)
> > diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
> > index 27d6ab11f9ee..bdfd66ba3843 100644
> > --- a/net/ceph/messenger.c
> > +++ b/net/ceph/messenger.c
> > @@ -412,7 +412,7 @@ static void ceph_sock_state_change(struct sock *sk)
> >       switch (sk->sk_state) {
> >       case TCP_CLOSE:
> >               dout("%s TCP_CLOSE\n", __func__);
> > -             /* fall through */
> > +             fallthrough;
> >       case TCP_CLOSE_WAIT:
> >               dout("%s TCP_CLOSE_WAIT\n", __func__);
> >               con_sock_state_closing(con);
> > @@ -2751,7 +2751,7 @@ static int try_read(struct ceph_connection *con)
> >                       switch (ret) {
> >                       case -EBADMSG:
> >                               con->error_msg = "bad crc/signature";
> > -                             /* fall through */
> > +                             fallthrough;
> >                       case -EBADE:
> >                               ret = -EIO;
> >                               break;
> > diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
> > index 3d8c8015e976..d633a0aeaa55 100644
> > --- a/net/ceph/mon_client.c
> > +++ b/net/ceph/mon_client.c
> > @@ -1307,7 +1307,7 @@ static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
> >                * request had a non-zero tid.  Work around this weirdness
> >                * by allocating a new message.
> >                */
> > -             /* fall through */
> > +             fallthrough;
> >       case CEPH_MSG_MON_MAP:
> >       case CEPH_MSG_MDS_MAP:
> >       case CEPH_MSG_OSD_MAP:
> > diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
> > index e4fbcad6e7d8..7901ab6c79fd 100644
> > --- a/net/ceph/osd_client.c
> > +++ b/net/ceph/osd_client.c
> > @@ -3854,7 +3854,7 @@ static void scan_requests(struct ceph_osd *osd,
> >                       if (!force_resend && !force_resend_writes)
> >                               break;
> >
> > -                     /* fall through */
> > +                     fallthrough;
> >               case CALC_TARGET_NEED_RESEND:
> >                       cancel_linger_map_check(lreq);
> >                       /*
> > @@ -3891,7 +3891,7 @@ static void scan_requests(struct ceph_osd *osd,
> >                            !force_resend_writes))
> >                               break;
> >
> > -                     /* fall through */
> > +                     fallthrough;
> >               case CALC_TARGET_NEED_RESEND:
> >                       cancel_map_check(req);
> >                       unlink_request(osd, req);
>
>
> Looks sane. Merged into ceph-client/testing branch.

I amended this to also cover fs/ceph and rbd.

Thanks,

                Ilya

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