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

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Date:   Thu, 23 Nov 2023 09:43:53 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
CC:     Rob Herring <robh@...nel.org>,
        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

Yo,

On Thu, Nov 23, 2023 at 04:38:37PM +0900, Masahiro Yamada 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.

We carry a copy of the dtc in scripts/dtc, so I would expect that before
an upgrade is done that would introduce new warnings we can fix them in
the relevant platforms. Perhaps I am misunderstanding something there,
but I'm sure Rob can clear it up if I made a mistake.

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

For RISC-V at least, there are currently no W=1 warnings while building
the dtbs (because I put effort into fixing them all) and I would like to
keep it that way, so that requirement is not a concern.

Cheers,
Conor.


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