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

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Message-Id: <Ys7svh29R5jA6QAr@google.com>
Date:   Wed, 13 Jul 2022 09:03:10 -0700
From:   sdf@...gle.com
To:     Francis Laniel <flaniel@...ux.microsoft.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        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>, 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 07/13, Francis Laniel wrote:
> Le mercredi 13 juillet 2022, 16:47:17 CEST Alexei Starovoitov a �crit :
> > 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

> Oops sorry, I will send a v4 dropping it.
> Nonetheless can you please send me a link for a discussion about this?

+1, Google only gives me the following:

https://lore.kernel.org/bpf/87czmwe26c.fsf@toke.dk/T/

(which is somewhat inconclusive?)