linux-kernel - Re: ANNOUNCE: pahole v1.24 (Faster BTF encoding, 64-bit BTF enum entries)

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Date:   Wed, 24 Aug 2022 16:36:18 +0200
From:   Luna Jernberg <droidbittin@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        droidbittin@...il.com
Cc:     dwarves@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alibek Omarov <a1ba.omarov@...il.com>,
        Kornilios Kourtis <kornilios@...valent.com>,
        Kui-Feng Lee <kuifeng@...com>, Yonghong Song <yhs@...com>,
        bpf@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>
Subject: Re: ANNOUNCE: pahole v1.24 (Faster BTF encoding, 64-bit BTF enum entries)

The Nvidia driver breaks

On 8/24/22, Arnaldo Carvalho de Melo <arnaldo.melo@...il.com> wrote:
> Em Wed, Aug 24, 2022 at 03:23:29PM +0200, Luna Jernberg escreveu:
>> This package breaks on Arch Linux at the moment and if you are using Arch
>> its recommended that you downgrade to 1.23
>
> Breaks in what sense? Can you please provide details?
>
> - Arnaldo
>
>> On Tue, Aug 23, 2022 at 1:59 AM Arnaldo Carvalho de Melo
>> <acme@...nel.org>
>> wrote:
>>
>> > Hi,
>> >
>> >         The v1.24 release of pahole and its friends is out, with faster
>> > BTF generation by parallelizing the encoding part in addition to the
>> > previoulsy parallelized DWARF loading, support for 64-bit BTF
>> > enumeration
>> > entries, signed BTF encoding of 'char', exclude/select DWARF loading
>> > based on the language that generated the objects, etc.
>> >
>> > Main git repo:
>> >
>> >    git://git.kernel.org/pub/scm/devel/pahole/pahole.git
>> >
>> > Mirror git repo:
>> >
>> >    https://github.com/acmel/dwarves.git
>> >
>> > tarball + gpg signature:
>> >
>> >    https://fedorapeople.org/~acme/dwarves/dwarves-1.24.tar.xz
>> >    https://fedorapeople.org/~acme/dwarves/dwarves-1.24.tar.bz2
>> >    https://fedorapeople.org/~acme/dwarves/dwarves-1.24.tar.sign
>> >
>> >         Thanks a lot to all the contributors and distro packagers,
>> > you're
>> > on the
>> > CC list, I appreciate a lot the work you put into these tools,
>> >
>> > Best Regards,
>> >
>> > BTF encoder:
>> >
>> > - Add support to BTF_KIND_ENUM64 to represent enumeration entries with
>> >   more than 32 bits.
>> >
>> > - Support multithreaded encoding, in addition to DWARF multithreaded
>> >   loading, speeding up the process.
>> >
>> >   Selected just like DWARF multithreaded loading, using the 'pahole -j'
>> >   option.
>> >
>> > - Encode 'char' type as signed.
>> >
>> > BTF Loader:
>> >
>> > - Add support to BTF_KIND_ENUM64.
>> >
>> > pahole:
>> >
>> > - Introduce --lang and --lang_exclude to specify the language the
>> >   DWARF compile units were originated from to use or filter.
>> >
>> >   Use case is to exclude Rust compile units while aspects of the
>> >   DWARF generated for it get sorted out in a way that the kernel
>> >   BPF verifier don't refuse loading the BTF generated from them.
>> >
>> > - Introduce --compile to generate compilable code in a similar fashion
>> > to:
>> >
>> >    bpftool btf dump file vmlinux format c > vmlinux.h
>> >
>> >   As with 'bpftool', this will notice type shadowing, i.e. multiple
>> > types
>> >   with the same name and will disambiguate by adding a suffix.
>> >
>> > - Don't segfault when processing bogus files.
>> >
>
> --
>
> - Arnaldo
>