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Date:   Thu, 23 Nov 2023 09:43:53 +0000
From:   Conor Dooley <conor.dooley@microchip.com>
To:     Masahiro Yamada <masahiroy@kernel.org>
CC:     Rob Herring <robh@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Schier <nicolas@fjasle.eu>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Alim Akhtar <alim.akhtar@samsung.com>,
        Conor Dooley <conor@kernel.org>,
        <linux-kbuild@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-riscv@lists.infradead.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-samsung-soc@vger.kernel.org>
Subject: Re: [PATCH v2 0/4] kbuild: Per arch/platform dtc warning levels
Message-ID: <20231123-deviator-camisole-645715ad02e9@wendy>
References: <20231122-dtc-warnings-v2-0-bd4087325392@kernel.org>
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Yo,

On Thu, Nov 23, 2023 at 04:38:37PM +0900, Masahiro Yamada wrote:
> On Thu, Nov 23, 2023 at 7:12=E2=80=AFAM Rob Herring <robh@kernel.org> wro=
te:
> >
> > 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@kernel.org>
> > ---
>=20
>=20
> There were some attempts in the past to enable W=3D1 in particular subsys=
tems,
> so here is a similar comment.
>=20
> Adding a new warning flag to W=3D1 is always safe without doing any compi=
le test.
>=20
> With this series, it would not be true any more because a new warning in =
W=3D1
> 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=3D option is not =
given.

For RISC-V at least, there are currently no W=3D1 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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