linux-kernel - Warning when compiling with python3.12

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Message-ID: <20230811084739.GY3902@linux.vnet.ibm.com>
Date:   Fri, 11 Aug 2023 14:17:39 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        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>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Sachin Sant <sachinp@...ux.ibm.com>
Subject: Warning when compiling with python3.12

Hi,

When trying to build on v6.5-rc4 with python 3.12 aka Python 3.12.0rc1 I am
hitting the below Warning messages.

I didn't see something similar reported upstream, hence thought of reporting.

/home/srikar/linux.git/scripts/bpf_doc.py:62: SyntaxWarning: invalid escape sequence '\w'
  arg_re = re.compile('((\w+ )*?(\w+|...))( (\**)(\w+))?$')
/home/srikar/linux.git/scripts/bpf_doc.py:64: SyntaxWarning: invalid escape sequence '\*'
  proto_re = re.compile('(.+) (\**)(\w+)\(((([^,]+)(, )?){1,5})\)$')
/home/srikar/linux.git/scripts/bpf_doc.py:117: SyntaxWarning: invalid escape sequence '\*'
  p = re.compile(' \* ?(BPF\w+)$')
/home/srikar/linux.git/scripts/bpf_doc.py:121: SyntaxWarning: invalid escape sequence '\*'
  end_re = re.compile(' \* ?NOTES$')
/home/srikar/linux.git/scripts/bpf_doc.py:136: SyntaxWarning: invalid escape sequence '\*'
  p = re.compile(' \* ?((.+) \**\w+\((((const )?(struct )?(\w+|\.\.\.)( \**\w+)?)(, )?){1,5}\))$')
/home/srikar/linux.git/scripts/bpf_doc.py:144: SyntaxWarning: invalid escape sequence '\*'
  p = re.compile(' \* ?(?:\t| {5,8})Description$')
/home/srikar/linux.git/scripts/bpf_doc.py:157: SyntaxWarning: invalid escape sequence '\*'
  p = re.compile(' \* ?(?:\t| {5,8})(?:\t| {8})(.*)')
/home/srikar/linux.git/scripts/bpf_doc.py:170: SyntaxWarning: invalid escape sequence '\*'
  p = re.compile(' \* ?(?:\t| {5,8})Return$')
/home/srikar/linux.git/scripts/bpf_doc.py:183: SyntaxWarning: invalid escape sequence '\*'
  p = re.compile(' \* ?(?:\t| {5,8})(?:\t| {8})(.*)')
/home/srikar/linux.git/scripts/bpf_doc.py:222: SyntaxWarning: invalid escape sequence '\s'
  bpf_p = re.compile('\s*(BPF\w+)+')
/home/srikar/linux.git/scripts/bpf_doc.py:227: SyntaxWarning: invalid escape sequence '\s'
  assign_p = re.compile('\s*(BPF\w+)\s*=\s*(BPF\w+)')
/home/srikar/linux.git/scripts/bpf_doc.py:242: SyntaxWarning: invalid escape sequence '\w'
  self.enum_syscalls = re.findall('(BPF\w+)+', bpf_cmd_str)
/home/srikar/linux.git/scripts/bpf_doc.py:266: SyntaxWarning: invalid escape sequence '\s'
  p = re.compile('\s*FN\((\w+), (\d+), ##ctx\)|\\\\')
/home/srikar/linux.git/scripts/bpf_doc.py:281: SyntaxWarning: invalid escape sequence '\('
  self.define_unique_helpers = re.findall('FN\(\w+, \d+, ##ctx\)', fn_defines_str)
/home/srikar/linux.git/scripts/bpf_doc.py:428: SyntaxWarning: invalid escape sequence '\*'
  '/{}/,/\*\//:include/uapi/linux/bpf.h'.format(delimiter)]
/home/srikar/linux.git/scripts/bpf_doc.py:499: SyntaxWarning: invalid escape sequence '\ '
  footer = '''
/home/srikar/linux.git/scripts/bpf_doc.py:601: SyntaxWarning: invalid escape sequence '\ '
  one_arg += ' {}**\ '.format(a['star'].replace('*', '\\*'))

However I am not seeing this when using python 3.10 (Python 3.10.12) and
python 3.11 (Python 3.11.4). Note this is just a warning and Kernel build does
complete.

-- 
Thanks and Regards
Srikar Dronamraju