linux-kernel - Re: [PATCH 2/2] PCI: Drop controller CONFIG

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Message-ID: <CAMuHMdX4FKDnAN8DNsBG0jRF0rUxTVwDa9=AmMR4FTrdnJErrQ@mail.gmail.com>
Date:   Tue, 15 Nov 2022 20:27:18 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/2] PCI: Drop controller CONFIG_OF dependencies

Hi Bjorn,

On Tue, Nov 15, 2022 at 7:07 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> On Tue, Nov 15, 2022 at 04:56:10PM +0100, Geert Uytterhoeven wrote:
> > On Tue, Oct 25, 2022 at 9:16 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > > From: Bjorn Helgaas <bhelgaas@...gle.com>
> > >
> > > Many drivers depend on OF interfaces, so they won't be functional if
> > > CONFIG_OF is not set.  But OF provides stub functions in that case, so drop
> > > the OF dependencies so we can at least compile-test the drivers.
>
> > > --- a/drivers/pci/controller/Kconfig
> > > +++ b/drivers/pci/controller/Kconfig
> > > @@ -8,7 +8,6 @@ config PCI_MVEBU
> > >         depends on ARCH_MVEBU || ARCH_DOVE || COMPILE_TEST
> > >         depends on MVEBU_MBUS
> > >         depends on ARM
> > > -       depends on OF
> >
> > This is exactly why we have the COMPILE_TEST symbol.
> > There is no point in bothering all users who configure kernels with
> > questions about drivers that won't function anyway due to missing
> > dependencies, unless the user explicitly wants to do compile-testing.
> >
> > So all of these should become:
> >
> >     depends on OF || COMPILE_TEST
>
> Oh, yes, thanks for pointing this out, I totally blew it here.  I
> dropped this while we figure it out.
>
> Do you have a preference between this:
>
>   depends on ARCH_MVEBU || ARCH_DOVE || COMPILE_TEST
>   depends on OF || COMPILE_TEST
>
> and this:
>
>   depends on ((ARCH_MVEBU || ARCH_DOVE) && OF) || COMPILE_TEST
>
> The latter seems more common and doesn't repeat "COMPILE_TEST", but I
> can see advantages to the former.

Personally, I prefer the former, as it is easier to parse for a human.
Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds