linux-kernel - Re: [PATCH v3] kbuild: Enable DT schema checks for %.dtb targets

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Date:   Sat, 16 Jul 2022 17:12:38 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Tom Rini <trini@...sulko.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v3] kbuild: Enable DT schema checks for %.dtb targets

On Sat, Jul 16, 2022 at 8:02 AM Rob Herring <robh@...nel.org> wrote:
>
> On Thu, Jun 23, 2022 at 8:44 AM Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > It is possible to build a single dtb, but not with DT schema validation
> > enabled. Enable the schema validation to run for %.dtb and %.dtbo
> > targets. Anyone building a dtb for a specific platform *should* pay
> > attention to schema warnings.
> >
> > This could be supported with a separate %.dt.yaml target instead.
> > However, the .dt.yaml format is considered an intermediate format and
> > could possibly go away at some point if schema checking is integrated
> > into dtc. Also, the plan is to enable the schema checks by default once
> > platforms are free of warnings, and this is a move in that direction.
> >
> > This patch differs from the previous one ([1]) in the fact that it
> > requires specifying VALIDATE_DT=1 to run the checks while doing the
> > build. Thus default build procedures would not obtain additional build
> > dependency, while maintainers can still build a single DTB file an get
> > only corresponding warnings.
>
> I'd rather this be a kconfig option, so that eventually 'make
> allmodconfig; make dtbs' also runs the schema checks. If something can
> be enabled for allmodconfig, then builders will automatically start
> testing it. Though the extra dependency is a problem here.


The dependency on libyaml is gone.

As for the dependency on dt-schema, is it a good idea to
pull it into the kernel tree somewhere,
like we periodically sync scripts/dtc/ with its upstream?

Any other problematic tool dependency?





>
> >
> > [1] https://lore.kernel.org/all/20210913145146.766080-1-robh@kernel.org/
> >
> > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Cc: Tom Rini <trini@...sulko.com>
> > Cc: Masahiro Yamada <masahiroy@...nel.org>
> > Cc: linux-kbuild@...r.kernel.org
> > Co-developed-by: Rob Herring <robh@...nel.org>
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >  Makefile | 18 ++++++++++++++----
> >  1 file changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/Makefile b/Makefile
> > index c43d825a3c4c..0942922384c4 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -1365,11 +1365,17 @@ endif
> >
> >  ifneq ($(dtstree),)
> >
> > -%.dtb: include/config/kernel.release scripts_dtc
> > -       $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
> > +ifneq ($(VALIDATE_DT),)
> > +DT_YAML = $(dtstree)/$*.dt.yaml
>
> .dt.yaml files are deprecated now. This probably doesn't do anything.

Right, this causes a build error.


masahiro@...ver:~/ref/linux$ make ARCH=arm64 VALIDATE_DT=1
arm/foundation-v8.dtb
arch/arm64/Makefile:36: Detected assembler with broken .inst;
disassembly will be unreliable
  DTC     arch/arm64/boot/dts/arm/foundation-v8.dtb
  CHECK   arch/arm64/boot/dts/arm/foundation-v8.dtb
/home/masahiro/ref/linux/arch/arm64/boot/dts/arm/foundation-v8.dtb:
sysreg@...00: '#address-cells' is a required property
>From schema: /home/masahiro/ref/linux/Documentation/devicetree/bindings/arm/vexpress-sysreg.yaml
/home/masahiro/ref/linux/arch/arm64/boot/dts/arm/foundation-v8.dtb:
sysreg@...00: '#size-cells' is a required property
>From schema: /home/masahiro/ref/linux/Documentation/devicetree/bindings/arm/vexpress-sysreg.yaml
make[1]: *** No rule to make target
'arch/arm64/boot/dts/arm/foundation-v8.dt.yaml'.  Stop.
make: *** [Makefile:1379: arm/foundation-v8.dtb] Error 2







--
Best Regards

Masahiro Yamada