linux-kernel - Re: [PATCH bpf-next v3 6/6] selftests/bpf: Remove the casting about jited_ksyms and jited

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Message-ID: <CAEf4Bza4RT=KFhr9ev29967dyT0eF_+6ZRqK35beUvnA_NbcqQ@mail.gmail.com>
Date:   Fri, 3 Jun 2022 14:05:09 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Pu Lehui <pulehui@...wei.com>
Cc:     bpf <bpf@...r.kernel.org>, linux-riscv@...ts.infradead.org,
        Networking <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH bpf-next v3 6/6] selftests/bpf: Remove the casting about
 jited_ksyms and jited_linfo

On Mon, May 30, 2022 at 1:58 AM Pu Lehui <pulehui@...wei.com> wrote:
>
> We have unified data extension operation of jited_ksyms and jited_linfo
> into zero extension, so there's no need to cast u64 memory address to
> long data type.
>
> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---
>  tools/testing/selftests/bpf/prog_tests/btf.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c
> index e6612f2bd0cf..65bdc4aa0a63 100644
> --- a/tools/testing/selftests/bpf/prog_tests/btf.c
> +++ b/tools/testing/selftests/bpf/prog_tests/btf.c
> @@ -6599,8 +6599,8 @@ static int test_get_linfo(const struct prog_info_raw_test *test,
>         }
>
>         if (CHECK(jited_linfo[0] != jited_ksyms[0],
> -                 "jited_linfo[0]:%lx != jited_ksyms[0]:%lx",
> -                 (long)(jited_linfo[0]), (long)(jited_ksyms[0]))) {
> +                 "jited_linfo[0]:%llx != jited_ksyms[0]:%llx",
> +                 jited_linfo[0], jited_ksyms[0])) {

__u64 is not always printed with %lld, on some platforms it is
actually %ld, so to avoid compiler warnings we just cast them to long
long or unsigned long long (and then %lld or %llu is fine). So please
update this part here and below.

>                 err = -1;
>                 goto done;
>         }
> @@ -6618,16 +6618,16 @@ static int test_get_linfo(const struct prog_info_raw_test *test,
>                 }
>
>                 if (CHECK(jited_linfo[i] <= jited_linfo[i - 1],
> -                         "jited_linfo[%u]:%lx <= jited_linfo[%u]:%lx",
> -                         i, (long)jited_linfo[i],
> -                         i - 1, (long)(jited_linfo[i - 1]))) {
> +                         "jited_linfo[%u]:%llx <= jited_linfo[%u]:%llx",
> +                         i, jited_linfo[i],
> +                         i - 1, jited_linfo[i - 1])) {
>                         err = -1;
>                         goto done;
>                 }
>
>                 if (CHECK(jited_linfo[i] - cur_func_ksyms > cur_func_len,
> -                         "jited_linfo[%u]:%lx - %lx > %u",
> -                         i, (long)jited_linfo[i], (long)cur_func_ksyms,
> +                         "jited_linfo[%u]:%llx - %llx > %u",
> +                         i, jited_linfo[i], cur_func_ksyms,
>                           cur_func_len)) {
>                         err = -1;
>                         goto done;
> --
> 2.25.1
>