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From:   Simon Glass <sjg@chromium.org>
Date:   Sun, 26 Feb 2023 12:23:00 -0700
Message-ID: <CAPnjgZ2hcKnzzAyy4m44L1hQ_wYbCq-3ZX0g57bvVdYjyPPL_g@mail.gmail.com>
Subject: Re: [PATCH] kconfig: Proposed language extension for multiple builds
To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Tom Rini <trini@konsulko.com>,
        U-Boot Mailing List <u-boot@lists.denx.de>,
        lk <linux-kernel@vger.kernel.org>
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Hi Masahiro,

On Sun, 26 Feb 2023 at 10:36, Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Sun, Feb 26, 2023 at 11:44=E2=80=AFPM Tom Rini <trini@konsulko.com> wr=
ote:
> >
> > 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.or=
g> 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@chromiu=
m.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 'g=
ain
> > > > control' of a particular feature in a phase.
> > > >
> > > > My intent in sending this patch was to check whether this support f=
or
> > > > 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 i=
n
> > 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.

I'm disappointed in this attitude. It is the same thing that we saw
from the DT bindings until recently.

>
> 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.

How about refactoring patches that would make a possible
implementation easier to maintain, like [1] ? Would they be
acceptable?

>
>
> The multi-phase is too cluttered, and that is not what Linux wants to hav=
e.

Clearly it is not useful to Linux, which only has one build.

Regards,
Simon

[1] https://patchwork.ozlabs.org/project/uboot/patch/20230212231638.1134219=
-61-sjg@chromium.org/