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From:   Justin Stitt <justinstitt@google.com>
Date:   Thu, 5 Oct 2023 12:52:34 -0700
Message-ID: <CAFhGd8rGZ6w7bz90LRnwd_1K3ibR2KsT6cJ2kiuO5mSAdnWjFw@mail.gmail.com>
Subject: Re: [PATCH] get_maintainer/MAINTAINERS: confine K content matching to patches
To:     Joe Perches <joe@perches.com>
Cc:     linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>,
        Nick Desaulniers <ndesaulniers@google.com>
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On Thu, Oct 5, 2023 at 11:42=E2=80=AFAM Joe Perches <joe@perches.com> wrote=
:
>
> On Thu, 2023-10-05 at 11:30 -0700, Justin Stitt wrote:
> > On Thu, Oct 5, 2023 at 11:15=E2=80=AFAM Joe Perches <joe@perches.com> w=
rote:
> > >
> > > On Thu, 2023-10-05 at 11:06 -0700, Justin Stitt wrote:
> > > > On Wed, Oct 4, 2023 at 7:40=E2=80=AFPM Joe Perches <joe@perches.com=
> wrote:
> > > > >
> > > > > On Wed, 2023-10-04 at 21:21 +0000, Justin Stitt wrote:
> > > > > > The current behavior of K: is a tad bit noisy. It matches again=
st the
> > > > > > entire contents of files instead of just against the contents o=
f a
> > > > > > patch.
> > > > > >
> > > > > > This means that a patch with a single character change (fixing =
a typo or
> > > > > > whitespace or something) would still to/cc maintainers and list=
s if the
> > > > > > affected file matched against the regex pattern given in K:. Fo=
r
> > > > > > example, if a file has the word "clang" in it then every single=
 patch
> > > > > > touching that file will to/cc Nick, Nathan and some lists.
> > > > > >
> > > > > > Let's change this behavior to only content match against patche=
s
> > > > > > (subjects, message, diff) as this is what most people expect th=
e
> > > > > > behavior already is. Most users of "K:" would prefer patch-only=
 content
> > > > > > matching. If this is not the case let's add a new matching type=
 as
> > > > > > proposed in [1].
> > > > >
> > > > > I'm glad to know  you are coming around to my suggestion.
> > > > :)
> > > >
> > > > >
> > > > > I believe the file-based keyword matching should _not_ be
> > > > > removed and the option should be added for it like I suggested.
> > > >
> > > > Having a command line flag allowing get_maintainer.pl
> > > > users to decide the behavior of K: is weird to me. If I'm a maintai=
ner setting
> > > > my K: in MAINTAINERS I want some sort of consistent behavior. Some
> > > > patches will start hitting mailing list that DO have keywords in th=
e patch
> > > > and others, confusingly, not.
> > >
> > > Not true.
> > >
> > > If a patch contains a keyword match, get_maintainers will _always_
> > > show the K: keyword maintainers unless --nokeywords is specified
> > > on the command line.
> >
> > ...
> >
> > >
> > > If a file contains a keyword match, it'll only show the K:
> > > keyword  if --keywords-in-file is set.
> >
> > Right, what I'm saying is a patch can arrive in a maintainer's inbox
> > wherein the patch itself has no mention of the keyword (if
> > get_maintainer user opted for --keywords-in-file). Just trying to
> > avoid some cases of the question: "Why is this in my inbox?"
>
> Because the script user specifically asked for it.
>
> > > > To note, we get some speed-up here as pattern matching a patch that
> > > > touches lots of files would result in searching all of them in thei=
r
> > > > entirety. Just removing this behavior _might_ have a measurable
> > > > speed-up for patch series touching dozens of files.
> > >
> > > Again, not true.
> > >
> > > Patches do _not_ scan the original modified files for keyword matches=
.
> > > Only the patch itself is scanned.  That's the current behavior as wel=
l.
> > >
> >
> > Feel like I'm missing something here. How is K: matching keywords in
> > files without reading them.
> >
> > If my patch touches 10 files then all 10 of those files are scanned for
> > K: matches right?
>
> Nope.
>
> Understand the patches are the input to get_maintainer and not
> just files.
>
> If a patch is fed to get_maintainer then any files modified by
> the patch are _not_ scanned.
>
> Only the patch _content_ is used for keyword matches.
>

Got it. I'll roll your patch into a v3.

Thanks
Justin