linux-kernel - Re: [PATCH v2 0/4] Compile-test UAPI and kernel headers

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Date:   Thu, 27 Jun 2019 14:39:24 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Tony Luck <tony.luck@...el.com>, linux-doc@...r.kernel.org,
        John Fastabend <john.fastabend@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        linux-riscv@...ts.infradead.org,
        Daniel Borkmann <daniel@...earbox.net>,
        xdp-newbies@...r.kernel.org, Anton Vorontsov <anton@...msg.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Albert Ou <aou@...s.berkeley.edu>,
        Colin Cross <ccross@...roid.com>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Alexei Starovoitov <ast@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2 0/4] Compile-test UAPI and kernel headers

On Thu, 27 Jun 2019, Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:
> 1/4: reworked v2.
>
> 2/4: fix a flaw I noticed when I was working on this series
>
> 3/4: maybe useful for 4/4 and in some other places
>
> 4/4: v2. compile as many headers as possible.
>
>
> Changes in v2:
>  - Add CONFIG_CPU_{BIG,LITTLE}_ENDIAN guard to avoid build error
>  - Use 'header-test-' instead of 'no-header-test'
>  - Avoid weird 'find' warning when cleaning
>   - New patch
>   - New patch
>   - Add everything to test coverage, and exclude broken ones
>   - Rename 'Makefile' to 'Kbuild'
>   - Add CONFIG_KERNEL_HEADER_TEST option
>
> Masahiro Yamada (4):
>   kbuild: compile-test UAPI headers to ensure they are self-contained
>   kbuild: do not create wrappers for header-test-y
>   kbuild: support header-test-pattern-y
>   kbuild: compile-test kernel headers to ensure they are self-contained

[responding here because I didn't receive the actual patch]

This looks like it's doing what it's supposed to, but I ran into a bunch
of build fails with CONFIG_OF=n. Sent a fix to one [1], but stopped at
the next. Looks like you'll have to exclude more. And I'm pretty sure
we'll uncover more configurations where this will fail.

But I do applaud the goal, and I'm committed to making all include/drm
headers self-contained. I wouldn't block this based on the issues, it's
pretty much the only way to expose them and get them fixed/excluded, and
it's behind a config knob after all.

With the caveat that I didn't finish the build, but OTOH tested the
rainy day scenario and had the patch find issues it's meant to find:

Tested-by: Jani Nikula <jani.nikula@...el.com>


[1] http://patchwork.freedesktop.org/patch/msgid/20190627110103.7539-1-jani.nikula@intel.com

>
>  .gitignore                         |    1 -
>  Documentation/dontdiff             |    1 -
>  Documentation/kbuild/makefiles.txt |   13 +-
>  Makefile                           |    4 +-
>  include/Kbuild                     | 1134 ++++++++++++++++++++++++++++
>  init/Kconfig                       |   22 +
>  scripts/Makefile.build             |   10 +-
>  scripts/Makefile.lib               |   12 +-
>  scripts/cc-system-headers.sh       |    8 +
>  usr/.gitignore                     |    1 -
>  usr/Makefile                       |    2 +
>  usr/include/.gitignore             |    3 +
>  usr/include/Makefile               |  133 ++++
>  13 files changed, 1331 insertions(+), 13 deletions(-)
>  create mode 100644 include/Kbuild
>  create mode 100755 scripts/cc-system-headers.sh
>  create mode 100644 usr/include/.gitignore
>  create mode 100644 usr/include/Makefile

-- 
Jani Nikula, Intel Open Source Graphics Center