netdev - Re: [PATCH] libbpf: Fix up generation of bpf_helper

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Message-ID: <87d0dexyij.fsf@toke.dk>
Date:   Tue, 26 Nov 2019 19:50:44 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Andrii Nakryiko <andriin@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Olsa <jolsa@...nel.org>, Martin KaFai Lau <kafai@...com>,
        Namhyung Kim <namhyung@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libbpf: Fix up generation of bpf_helper_defs.h

Arnaldo Carvalho de Melo <arnaldo.melo@...il.com> writes:

> Em Tue, Nov 26, 2019 at 05:38:18PM +0100, Toke Høiland-Jørgensen escreveu:
>> Arnaldo Carvalho de Melo <arnaldo.melo@...il.com> writes:
>> 
>> > Em Tue, Nov 26, 2019 at 12:10:45PM -0300, Arnaldo Carvalho de Melo escreveu:
>> >> Hi guys,
>> >> 
>> >>    While merging perf/core with mainline I found the problem below for
>> >> which I'm adding this patch to my perf/core branch, that soon will go
>> >> Ingo's way, etc. Please let me know if you think this should be handled
>> >> some other way,
>> >
>> > This is still not enough, fails building in a container where all we
>> > have is the tarball contents, will try to fix later.
>> 
>> Wouldn't the right thing to do not be to just run the script, and then
>> put the generated bpf_helper_defs.h into the tarball?
>
> I would rather continue just running tar and have the build process
> in-tree or outside be the same.

Hmm, right. Well that Python script basically just parses
include/uapi/linux/bpf.h; and it can be given the path of that file with
the --filename argument. So as long as that file is present, it should
be possible to make it work, I guess?

However, isn't the point of the tarball to make a "stand-alone" source
distribution? I'd argue that it makes more sense to just include the
generated header, then: The point of the Python script is specifically
to extract the latest version of the helper definitions from the kernel
source tree. And if you're "freezing" a version into a tarball, doesn't
it make more sense to also freeze the list of BPF helpers?

-Toke