linux-kernel - Re: [PATCH] checkpatch: Warn if DT bindings are not in schema format

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Message-ID: <CAL_JsqKAbP6KYjiJ6dLr=dpFG-j-e4rJPCKZ0+pZrDjsSPAUPQ@mail.gmail.com>
Date:   Fri, 27 Sep 2019 10:39:11 -0500
From:   Rob Herring <robh@...nel.org>
To:     Joe Perches <joe@...ches.com>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] checkpatch: Warn if DT bindings are not in schema format

On Fri, Sep 27, 2019 at 9:29 AM Joe Perches <joe@...ches.com> wrote:
>
> On Fri, 2019-09-27 at 09:02 -0500, Rob Herring wrote:
> > On Fri, Sep 13, 2019 at 4:48 PM Joe Perches <joe@...ches.com> wrote:
> > > On Fri, 2019-09-13 at 16:13 -0500, Rob Herring wrote:
> > > > DT bindings are moving to using a json-schema based schema format
> > > > instead of freeform text. Add a checkpatch.pl check to encourage using
> > > > the schema for new bindings. It's not yet a requirement, but is
> > > > progressively being required by some maintainers.
> > > []
> > > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > > []
> > > > @@ -2822,6 +2822,14 @@ sub process {
> > > >                            "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
> > > >               }
> > > >
> > > > +# Check for adding new DT bindings not in schema format
> > > > +             if (!$in_commit_log &&
> > > > +                 ($line =~ /^new file mode\s*\d+\s*$/) &&
> > > > +                 ($realfile =~ m@...cumentation/devicetree/bindings/.*\.txt$@)) {
> > > > +                     WARN("DT_SCHEMA_BINDING_PATCH",
> > > > +                          "DT bindings should be in DT schema format. See: Documentation/devicetree/writing-schema.rst\n");
> > > > +             }
> > > > +
> > >
> > > As this already seems to be git dependent, perhaps
> >
> > It's quite rare to see a non git generated diff these days.
> >
> > > it's easier to read with a single line test like:
> > >
> > >                 if ($line =~ m{^\s*create mode\s*\d+\s*Documentation/devicetree/bindings/.*\.txt$}) {
> > >                         etc...
> > >                 }
> >
> > I frequently do 'git show $commit | scripts/checkpatch.pl' and this
> > doesn't work with that. I really should have a '--pretty=email' in
> > there, but I just ignore the commit msg warnings. In any case, that
> > still doesn't help because there's no diffstat. There's probably some
> > way to turn that on or just use git-format-patch, but really we want
> > this to work with any git diff.
>
> I don't understand your argument against what I proposed at all.

It is dependent on the commit message rather than the diff itself. I
want it to work with or without a diffstat.

> and btw:
>
> $ git format-patch -1 --stdout <commit> | ./scripts/checkpatch.pl

Yes, I stated this was possible. My concern is there are lots of ways
to generate a diff in git. My way works for *all* of them. Yours
doesn't.

Rob