linux-kernel - Re: [PATCH] bpf_doc: Fix build error with older python versions

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Date:   Fri, 6 Jan 2023 23:11:50 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Quentin Monnet <quentin@...valent.com>,
        Michal Suchanek <msuchanek@...e.de>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        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>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        "open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)" 
        <bpf@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf_doc: Fix build error with older python versions

On 1/6/23 1:11 PM, Quentin Monnet wrote:
> 2023-01-06 12:40 UTC+0100 ~ Michal Suchanek <msuchanek@...e.de>
>> + make -j48 -s -C /dev/shm/kbuild/linux.33946/current ARCH=powerpc HOSTCC=gcc CROSS_COMPILE=powerpc64-suse-linux- clean
>> TypeError: '_sre.SRE_Match' object is not subscriptable
>>
>> Fixes: 8a76145a2ec2 ("bpf: explicitly define BPF_FUNC_xxx integer values")
>>
>> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
>> ---
>>   scripts/bpf_doc.py | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/scripts/bpf_doc.py b/scripts/bpf_doc.py
>> index e8d90829f23e..38d51e05c7a2 100755
>> --- a/scripts/bpf_doc.py
>> +++ b/scripts/bpf_doc.py
>> @@ -271,7 +271,7 @@ class HeaderParser(object):
>>               if capture:
>>                   fn_defines_str += self.line
>>                   helper_name = capture.expand(r'bpf_\1')
>> -                self.helper_enum_vals[helper_name] = int(capture[2])
>> +                self.helper_enum_vals[helper_name] = int(capture.group(2))
>>                   self.helper_enum_pos[helper_name] = i
>>                   i += 1
>>               else:
> 
> Thanks, the change looks good.
> 
> Acked-by: Quentin Monnet <quentin@...valent.com>
> 
> Would be nice to have a bit more context in the commit log: As I
> understand, Match objects have been scriptable since Python 3.6 (2016).
> 
> Reference: https://docs.python.org/3/whatsnew/3.6.html#re

Agree, Michal, could you improve the commit description as it's a bit terse
as-is and then resubmit your patch.

Thanks,
Daniel