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

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Message-ID: <CAEf4BzahAuskkD9YqxQpZDaUcu_jTuNAfbkkwP4dzJH=cTaVKA@mail.gmail.com>
Date:   Fri, 3 Nov 2023 09:26:12 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Anders Roxell <anders.roxell@...aro.org>
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, 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.

> 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
>
>