linux-kernel - Re: [PATCH v5 00/15] Don't generate netlink .rst files inside $(srctree)

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Message-ID: <m2msa6ikyk.fsf@gmail.com>
Date: Tue, 17 Jun 2025 13:58:11 +0100
From: Donald Hunter <donald.hunter@...il.com>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc: Linux Doc Mailing List <linux-doc@...r.kernel.org>,  Jonathan Corbet
 <corbet@....net>,  linux-kernel@...r.kernel.org,  Akira Yokosawa
 <akiyks@...il.com>,  "David S. Miller" <davem@...emloft.net>,  Ignacio
 Encinas Rubio <ignacio@...cinas.com>,  Marco Elver <elver@...gle.com>,
  Shuah Khan <skhan@...uxfoundation.org>,  Eric Dumazet
 <edumazet@...gle.com>,  Jan Stancek <jstancek@...hat.com>,  Paolo Abeni
 <pabeni@...hat.com>,  Ruben Wauters <rubenru09@....com>,
  joel@...lfernandes.org,  linux-kernel-mentees@...ts.linux.dev,
  lkmm@...ts.linux.dev,  netdev@...r.kernel.org,  peterz@...radead.org,
  stern@...land.harvard.edu,  Breno Leitao <leitao@...ian.org>
Subject: Re: [PATCH v5 00/15] Don't generate netlink .rst files inside
 $(srctree)

Mauro Carvalho Chehab <mchehab+huawei@...nel.org> writes:

> As discussed at:
>    https://lore.kernel.org/all/20250610101331.62ba466f@foz.lan/
>
> changeset f061c9f7d058 ("Documentation: Document each netlink family")
> added a logic which generates *.rst files inside $(srctree). This is bad
> when O=<BUILDDIR> is used.
>
> A recent change renamed the yaml files used by Netlink, revealing a bad
> side effect: as "make cleandocs" don't clean the produced files and symbols
> appear duplicated for people that don't build the kernel from scratch.
>
> This series adds an yaml parser extension and uses an index file with glob for
> *. We opted to write such extension in a way that no actual yaml conversion
> code is inside it. This makes it flexible enough to handle other types of yaml
> files in the future. The actual yaml conversion logic were placed at 
> netlink_yml_parser.py. 
>
> As requested by YNL maintainers, this version has netlink_yml_parser.py
> inside tools/net/ynl/pyynl/ directory. I don't like mixing libraries with
> binaries, nor to have Python libraries spread all over the Kernel. IMO,
> the best is to put all of them on a common place (scripts/lib, python/lib,
> lib/python, ...) but, as this can be solved later, for now let's keep it this
> way.
>
> ---

Note that the series leaves the YNL build broken.

make -C tools/net/ynl/
make: Entering directory '/home/donaldh/net-next/tools/net/ynl'
make[1]: Entering directory '/home/donaldh/net-next/tools/net/ynl/lib'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/donaldh/net-next/tools/net/ynl/lib'
make[1]: Entering directory '/home/donaldh/net-next/tools/net/ynl/generated'
	GEN_RST conntrack.rst
Traceback (most recent call last):
  File "/home/donaldh/net-next/tools/net/ynl/generated/../pyynl/ynl_gen_rst.py", line 90, in <module>
    main()
    ~~~~^^
  File "/home/donaldh/net-next/tools/net/ynl/generated/../pyynl/ynl_gen_rst.py", line 86, in main
    write_to_rstfile(content, args.output)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/home/donaldh/net-next/tools/net/ynl/generated/../pyynl/ynl_gen_rst.py", line 64, in write_to_rstfile
    os.makedirs(directory, exist_ok=True)
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen os>", line 227, in makedirs
FileNotFoundError: [Errno 2] No such file or directory: ''
make[1]: *** [Makefile:56: conntrack.rst] Error 1
make[1]: Leaving directory '/home/donaldh/net-next/tools/net/ynl/generated'
make: *** [Makefile:25: generated] Error 2
make: Leaving directory '/home/donaldh/net-next/tools/net/ynl'