netdev - Re: [PATCH 1/1] Documentation: Add minimum pahole version

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Date:   Wed, 17 Nov 2021 23:33:24 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jonathan Corbet <corbet@....net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Documentation: Add minimum pahole version

On 11/16/21 7:21 PM, Andrii Nakryiko wrote:
> On Tue, Nov 16, 2021 at 7:40 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
>>
>> A report was made in https://github.com/acmel/dwarves/issues/26 about
>> pahole not being listed in the process/changes.rst file as being needed
>> for building the kernel, address that.
>>
>> Link: https://github.com/acmel/dwarves/issues/26
>> Cc: Alexei Starovoitov <ast@...nel.org>
>> Cc: Andrii Nakryiko <andrii@...nel.org>
>> Cc: Daniel Borkmann <daniel@...earbox.net>
>> Cc: Jiri Olsa <jolsa@...hat.com>
>> Cc: Jonathan Corbet <corbet@....net>
>> Cc: bpf@...r.kernel.org
>> Cc: netdev@...r.kernel.org
>> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>> ---
>>   Documentation/process/changes.rst | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
>> index e35ab74a0f804b04..c45f167a1b6c02a4 100644
>> --- a/Documentation/process/changes.rst
>> +++ b/Documentation/process/changes.rst
>> @@ -35,6 +35,7 @@ GNU make               3.81             make --version
>>   binutils               2.23             ld -v
>>   flex                   2.5.35           flex --version
>>   bison                  2.0              bison --version
>> +pahole                 1.16             pahole --version
>>   util-linux             2.10o            fdformat --version
>>   kmod                   13               depmod -V
>>   e2fsprogs              1.41.4           e2fsck -V
>> @@ -108,6 +109,14 @@ Bison
>>   Since Linux 4.16, the build system generates parsers
>>   during build.  This requires bison 2.0 or later.
>>
>> +pahole:
>> +-------
>> +
>> +Since Linux 5.2 the build system generates BTF (BPF Type Format) from DWARF in
>> +vmlinux, a bit later from kernel modules as well, if CONFIG_DEBUG_INFO_BTF is
> 
> I'd probably emphasize a bit more that pahole is required only if
> CONFIG_DEBUG_INFO_BTF is selected by moving "If CONFIG_DEBUG_INFO_BTF
> is selected, " to the front. But either way looks good.

+1, I presume Jonathan will later pick up the v2?

> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> 
>> +selected.  This requires pahole v1.16 or later. It is found in the 'dwarves' or
>> +'pahole' distro packages or from https://fedorapeople.org/~acme/dwarves/.
>> +
>>   Perl
>>   ----
>>
>> --
>> 2.31.1
>>