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

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Date:   Fri, 29 Jul 2022 09:52:44 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.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 Fri, 29 Jul 2022 at 08:55, Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> 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.

The issue is that with the current rules the dt-validate isn't
re-executed on DT_SCHEMA_FILES changes. Thus comes my proposal.

-- 
With best wishes
Dmitry