linux-kernel - Re: [PATCH] kbuild: take into account DT_SCHEMA

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Date:   Fri, 29 Jul 2022 14:54:56 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH] kbuild: take into account DT_SCHEMA_FILES changes while
 checking dtbs

On Thu, Jul 28, 2022 at 2:36 AM Rob Herring <robh+dt@...nel.org> wrote:
>
> On Wed, Jul 27, 2022 at 4:06 AM Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > It is useful to be able to recheck dtbs files against a limited set of
> > DT schema files. This can be accomplished by using differnt
> > DT_SCHEMA_FILES argument values while rerunning make dtbs_check. However
> > for some reason if_changed_rule doesn't pick up the rule_dtc changes
> > (and doesn't retrigger the build).
> >
> > Fix this by changing if_changed_rule to if_changed_dep and squashing DTC
> > and dt-validate into a single new command. Then if_changed_dep triggers
> > on DT_SCHEMA_FILES changes and reruns the build/check.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >  scripts/Makefile.lib | 14 ++++++--------
> >  1 file changed, 6 insertions(+), 8 deletions(-)
> >
> > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> > index c88b98b5dc44..3df470289382 100644
> > --- a/scripts/Makefile.lib
> > +++ b/scripts/Makefile.lib
> > @@ -383,17 +383,15 @@ DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
> >  DT_BINDING_DIR := Documentation/devicetree/bindings
> >  DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
> >
> > -quiet_cmd_dtb_check =  CHECK   $@
> > -      cmd_dtb_check =  $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
> > +quiet_cmd_dtb =        DTC/CHECK   $@
>
> This is supposed to be 7 chars or less. DTCCHK or DTC_CHK perhaps. Or
> always do just 'DTC'. I can fixup when applying.
>
> I'll give it a few days for other comments.



When you change DT_SCHEMA_FILES, re-running dt-validate should be enough.
You do not need to re-run dtc.

I guess the strangeness comes from the fact that you are trying to do the
 two different things in a single rule.


--
Best Regards
Masahiro Yamada