linux-kernel - Re: [PATCH] selftests: bpf: xskxceiver: ksft_print

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Message-ID: <CADYN=9+koLV3eg85hVBkRtiAuygyngWxWChpnh=iUPVH4JeTjg@mail.gmail.com>
Date:   Wed, 8 Nov 2023 12:21:38 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests: bpf: xskxceiver: ksft_print_msg: fix format
 type error

On Fri, 3 Nov 2023 at 17:26, Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
>
> On Fri, Nov 3, 2023 at 4:23 AM Anders Roxell <anders.roxell@...aro.org> wrote:
> >
> > Crossbuilding selftests/bpf for architecture arm64, format specifies
> > type error show up like.
> >
> > xskxceiver.c:912:34: error: format specifies type 'int' but the argument
> > has type '__u64' (aka 'unsigned long long') [-Werror,-Wformat]
> >  ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%d]\n",
> >                                                                 ~~
> >                                                                 %llu
> >                 __func__, pkt->pkt_nb, meta->count);
> >                                        ^~~~~~~~~~~
> > xskxceiver.c:929:55: error: format specifies type 'unsigned long long' but
> >  the argument has type 'u64' (aka 'unsigned long') [-Werror,-Wformat]
> >  ksft_print_msg("Frag invalid addr: %llx len: %u\n", addr, len);
> >                                     ~~~~             ^~~~
> >
>
> With u64s it might be %llx or %lx, depending on architecture, so best
> is to force cast to (long long) or (unsigned long long) and then use
> %llx.

Thank you Andrii,
v2 posted https://lore.kernel.org/bpf/20231108110048.1988128-1-anders.roxell@linaro.org/T/#u

Cheers,
Anders

>
> > Fixing the issues by using the proposed format specifiers by the
> > compilor.
> >
> > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> > ---
> >  tools/testing/selftests/bpf/xskxceiver.c | 10 +++++-----
> >  1 file changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
> > index 591ca9637b23..dc03692f34d8 100644
> > --- a/tools/testing/selftests/bpf/xskxceiver.c
> > +++ b/tools/testing/selftests/bpf/xskxceiver.c
> > @@ -908,7 +908,7 @@ static bool is_metadata_correct(struct pkt *pkt, void *buffer, u64 addr)
> >         struct xdp_info *meta = data - sizeof(struct xdp_info);
> >
> >         if (meta->count != pkt->pkt_nb) {
> > -               ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%d]\n",
> > +               ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%llu]\n",
> >                                __func__, pkt->pkt_nb, meta->count);
> >                 return false;
> >         }
> > @@ -926,11 +926,11 @@ static bool is_frag_valid(struct xsk_umem_info *umem, u64 addr, u32 len, u32 exp
> >
> >         if (addr >= umem->num_frames * umem->frame_size ||
> >             addr + len > umem->num_frames * umem->frame_size) {
> > -               ksft_print_msg("Frag invalid addr: %llx len: %u\n", addr, len);
> > +               ksft_print_msg("Frag invalid addr: %lx len: %u\n", addr, len);
> >                 return false;
> >         }
> >         if (!umem->unaligned_mode && addr % umem->frame_size + len > umem->frame_size) {
> > -               ksft_print_msg("Frag crosses frame boundary addr: %llx len: %u\n", addr, len);
> > +               ksft_print_msg("Frag crosses frame boundary addr: %lx len: %u\n", addr, len);
> >                 return false;
> >         }
> >
> > @@ -1029,7 +1029,7 @@ static int complete_pkts(struct xsk_socket_info *xsk, int batch_size)
> >                         u64 addr = *xsk_ring_cons__comp_addr(&xsk->umem->cq, idx + rcvd - 1);
> >
> >                         ksft_print_msg("[%s] Too many packets completed\n", __func__);
> > -                       ksft_print_msg("Last completion address: %llx\n", addr);
> > +                       ksft_print_msg("Last completion address: %lx\n", addr);
> >                         return TEST_FAILURE;
> >                 }
> >
> > @@ -1513,7 +1513,7 @@ static int validate_tx_invalid_descs(struct ifobject *ifobject)
> >         }
> >
> >         if (stats.tx_invalid_descs != ifobject->xsk->pkt_stream->nb_pkts / 2) {
> > -               ksft_print_msg("[%s] tx_invalid_descs incorrect. Got [%u] expected [%u]\n",
> > +               ksft_print_msg("[%s] tx_invalid_descs incorrect. Got [%llu] expected [%u]\n",
> >                                __func__, stats.tx_invalid_descs,
> >                                ifobject->xsk->pkt_stream->nb_pkts);
> >                 return TEST_FAILURE;
> > --
> > 2.42.0
> >
> >