linux-kernel - Re: [PATCH v2 0/4] kbuild: Per arch/platform dtc warning levels

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Message-ID: <CAL_Jsq+N0GxwZ2YmspEzfiuGOw7M+DmYkyhLgaYtk+Ov2ycY_A@mail.gmail.com>
Date:   Mon, 27 Nov 2023 08:03:22 -0600
From:   Rob Herring <robh@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Conor Dooley <conor@...nel.org>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v2 0/4] kbuild: Per arch/platform dtc warning levels

On Thu, Nov 23, 2023 at 1:39 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Thu, Nov 23, 2023 at 7:12 AM Rob Herring <robh@...nel.org> wrote:
> >
> > This series adds support to set the dtc extra warning level on a per
> > arch or per platform (directory really) basis.
> >
> > The first version of this was just a simple per directory override for
> > Samsung platforms, but Conor asked to be able to do this for all of
> > riscv.
> >
> > For merging, either I can take the whole thing or the riscv and samsung
> > patches can go via their normal trees. The added variable will have no
> > effect until merged with patch 2.
> >
> > v1:
> >  - https://lore.kernel.org/all/20231116211739.3228239-1-robh@kernel.org/
> >
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
>
>
> There were some attempts in the past to enable W=1 in particular subsystems,
> so here is a similar comment.
>
> Adding a new warning flag to W=1 is always safe without doing any compile test.
>
> With this series, it would not be true any more because a new warning in W=1
> would potentially break riscv/samsung platforms.

The difference here is the people potentially adding warnings are also
the ones ensuring no warnings.

> Linus requires a clean build (i.e. zero warning) when W= option is not given.

Linus doesn't build any of this AFAICT. We are not always warning free
for W=0 with dtbs.

Rob