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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Mon, 27 Feb 2023 02:36:02 +0900
Message-ID: <CAK7LNAQyDnDiL4iY31Z82aWi-e-eiTdOqdsf3qzQ8f9dJTYwJQ@mail.gmail.com>
Subject: Re: [PATCH] kconfig: Proposed language extension for multiple builds
To:     Tom Rini <trini@konsulko.com>
Cc:     Simon Glass <sjg@chromium.org>,
        U-Boot Mailing List <u-boot@lists.denx.de>,
        lk <linux-kernel@vger.kernel.org>
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On Sun, Feb 26, 2023 at 11:44=E2=80=AFPM Tom Rini <trini@konsulko.com> wrot=
e:
>
> On Sun, Feb 26, 2023 at 11:32:03PM +0900, Masahiro Yamada wrote:
> > On Sun, Feb 26, 2023 at 11:04=E2=80=AFPM Simon Glass <sjg@chromium.org>=
 wrote:
> > >
> > > Hi Masahiro,
> > >
> > > On Sat, 25 Feb 2023 at 20:31, Masahiro Yamada <masahiroy@kernel.org> =
wrote:
> > > >
> > > > On Sat, Feb 25, 2023 at 11:38=E2=80=AFAM Simon Glass <sjg@chromium.=
org> wrote:
> > > > >
> > > > > +Masahiro Yamada
> > > >
> > > >
> > > >
> > > >
> > > > I do not know.
> > > > This seems a shorthand in Kconfig level.
> > > >
> > > >
> > > > masahiro@zoe:~/ref/u-boot(master)$ rgrep '^config SPL_' | wc
> > > >     540    1080   24872
> > > > masahiro@zoe:~/ref/u-boot(master)$ rgrep '^config TPL_' | wc
> > > >     163     326    7462
> > > >
> > > > If hundreds of duplications are not manageable,
> > > > go for it, but kconfig will be out-of-sync from the
> > > > upstream Kconfig.
> > >
> > > Yes that's right, it is a shorthand in Kconfig.
> > >
> > > The counts above understand the problem a little since quite a few
> > > CONFIG options without an SPL prefix are used in SPL. We don't have
> > > tools to estimate how many, and we sometimes add a new symbol to 'gai=
n
> > > control' of a particular feature in a phase.
> > >
> > > My intent in sending this patch was to check whether this support for
> > > configuring multiple related builds (or something like it) could go
> > > upstream, which for Kconfig is Linux, I believe. What do you think?
> >
> >
> > This complexity is absolutely unneeded for Linux.
> >
> > So, the answer is no.
>
> Well, I think Simon summarized himself a bit shorter here than he did in
> the patch itself.  So, to what extent does the kernel want to consider
> all of the other projects using the Kconfig language and their needs /
> use cases?
>
> --
> Tom


In principle, only features that are useful for Linux.

Kconfig has small piece of code that is useful for other projects,
for example,

    #ifndef CONFIG_
    #define CONFIG_ "CONFIG_"
    #endif

which might be useful for Buildroot, but this is exceptionally small.


The multi-phase is too cluttered, and that is not what Linux wants to have.


--=20
Best Regards
Masahiro Yamada