linux-kernel - Re: [PATCH] selftests/bpf: declare subprog_noise as static in tailcall

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Date:   Thu, 25 Aug 2022 21:44:13 -0700
From:   Song Liu <song@...nel.org>
To:     James Hilliard <james.hilliard1@...il.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/bpf: declare subprog_noise as static in tailcall_bpf2bpf4

On Thu, Aug 25, 2022 at 8:52 PM James Hilliard
<james.hilliard1@...il.com> wrote:
>
> Due to bpf_map_lookup_elem being declared static we need to also
> declare subprog_noise as static.
>
> Fixes the following error:
> progs/tailcall_bpf2bpf4.c:26:9: error: 'bpf_map_lookup_elem' is static but used in inline function 'subprog_noise' which is not static [-Werror]
>    26 |         bpf_map_lookup_elem(&nop_table, &key);
>       |         ^~~~~~~~~~~~~~~~~~~
>
> Signed-off-by: James Hilliard <james.hilliard1@...il.com>

Acked-by: Song Liu <song@...nel.org>

> ---
>  tools/testing/selftests/bpf/progs/tailcall_bpf2bpf4.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf4.c b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf4.c
> index b67e8022d500..a017d6b2f1dd 100644
> --- a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf4.c
> +++ b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf4.c
> @@ -19,7 +19,7 @@ struct {
>  int count = 0;
>  int noise = 0;
>
> -__always_inline int subprog_noise(void)
> +static __always_inline int subprog_noise(void)
>  {
>         __u32 key = 0;
>
> --
> 2.34.1
>