linux-kernel - Re: [PATCH bpf-next 2/2] selftests/bpf: ensure snprintf_btf/bpf_iter tests compatibility with old vmlinux.h

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Date:   Tue, 29 Sep 2020 11:08:45 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/2] selftests/bpf: ensure snprintf_btf/bpf_iter
 tests compatibility with old vmlinux.h

On Tue, Sep 29, 2020 at 5:26 AM Alan Maguire <alan.maguire@...cle.com> wrote:
>
> Andrii reports that bpf selftests relying on "struct btf_ptr" and BTF_F_*
> values will not build as vmlinux.h for older kernels will not include
> "struct btf_ptr" or the BTF_F_* enum values.  Undefine and redefine
> them to work around this.
>
> Fixes: b72091bd4ee4 ("selftests/bpf: Add test for bpf_seq_printf_btf helper")
> Fixes: 076a95f5aff2 ("selftests/bpf: Add bpf_snprintf_btf helper tests")
> Reported-by: Andrii Nakryiko <andrii.nakryiko@...il.com>
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> ---

That works, thanks!

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/testing/selftests/bpf/progs/bpf_iter.h       | 23 ++++++++++++++++++
>  tools/testing/selftests/bpf/progs/btf_ptr.h        | 27 ++++++++++++++++++++++
>  .../selftests/bpf/progs/netif_receive_skb.c        |  2 +-
>  3 files changed, 51 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/bpf/progs/btf_ptr.h
>

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