linux-kernel - Re: [PATCH v3 1/1] bpftool: Align dumped file generated header with skeletons.

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Date:   Wed, 13 Jul 2022 07:47:17 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Francis Laniel <flaniel@...ux.microsoft.com>
Cc:     bpf <bpf@...r.kernel.org>, Quentin Monnet <quentin@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, 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>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] bpftool: Align dumped file generated header with skeletons.

On Wed, Jul 13, 2022 at 7:45 AM Francis Laniel
<flaniel@...ux.microsoft.com> wrote:
>
> This commit adds the following lines to file generated by dump:
> /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
> /* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
> Hence, the dumped file headers follows that of skeletons.
>
> Signed-off-by: Francis Laniel <flaniel@...ux.microsoft.com>
> ---
>  tools/bpf/bpftool/btf.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
> index 7e6accb9d9f7..066a0acd0ecd 100644
> --- a/tools/bpf/bpftool/btf.c
> +++ b/tools/bpf/bpftool/btf.c
> @@ -425,6 +425,8 @@ static int dump_btf_c(const struct btf *btf,
>         if (err)
>                 return err;
>
> +       printf("/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n");

This was discussed earlier. It's incorrect and we cannot add just header
to vmlinux.h

> +       printf("/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */\n");
>         printf("#ifndef __VMLINUX_H__\n");
>         printf("#define __VMLINUX_H__\n");
>         printf("\n");
> --
> 2.25.1
>