linux-kernel - Re: [PATCH v2] scripts: Exclude Rust CUs with pahole

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Date:   Wed, 11 Jan 2023 12:02:12 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Eric Curtin <ecurtin@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Neal Gompa <neal@...pa.dev>, bpf@...r.kernel.org,
        rust-for-linux@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Yonghong Song <yhs@...com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [PATCH v2] scripts: Exclude Rust CUs with pahole

On 1/8/23 16:19, Eric Curtin wrote:
> On Sun, 8 Jan 2023 at 15:18, Eric Curtin <ecurtin@...hat.com> wrote:
>>
>> On Sun, 8 Jan 2023 at 02:15, Martin Rodriguez Reboredo
>> <yakoyoku@...il.com> wrote:
>>>
>>> [ ... ]
>>
>> If it was me, I would do things more like v1 of the patch (instead
>> just checking pahole version), because this is the only flag set in
>> scripts/Makefile.modfinal, which is a little confusing and
>> inconsistent. It's ok to set --lang_exclude=rust in all cases, as long
>> as pahole_ver is recent enough.
>>
>> +if [ "${pahole_ver}" -ge "124" ]; then
>> +       # see PAHOLE_HAS_LANG_EXCLUDE
>> +       extra_paholeopt="${extra_paholeopt} --lang_exclude=rust"
>> +fi
>>
>> But I'm not too opinionated either on this so...
>>
>> Reviewed-by: Eric Curtin <ecurtin@...hat.com>
>>
>> can be reapplied. I'm gonna test this again to see if it works in a
>> Fedora Asahi rpm build.
> 
> After testing I probably have to retract my Reviewed-by tag,
> apologies, bpf and all that did not work with this patch when I built
> in the fedora way, but, the good news is when I alter v1 of the patch
> to just check pahole version like so (instead of the is_enabled
> check):
> 
> +if [ "${pahole_ver}" -ge "124" ]; then
> +        # see PAHOLE_HAS_LANG_EXCLUDE
> +        extra_paholeopt="${extra_paholeopt} --lang_exclude=rust"
> +fi
> 
> it worked just fine, and that should satisfy the testbot and all the
> other ways we build too. Could we change to that @Martin Rodriguez
> Reboredo ?
> 

>From my POV I don't like this way due to it being set regardless whether
or not you are building the kernel with Rust. Though, because it doesn't
affect non `CONFIG_RUST` builds, I _think_ it won't hurt if we use that
way for now. Gonna send v3.

>>
>>
>>> +
>>>         vmlinux_link ${1}
>>>
>>>         info "BTF" ${2}
>>> --
>>> 2.39.0
>>>
>