linux-kernel - Re: [PATCH 6/9] PCI: consolidate PCI config entry in drivers/pci

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Date:   Fri, 19 Oct 2018 21:58:46 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-pci@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Alex Bounine <alex.bou9@...il.com>,
        mporter@...nel.crashing.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 6/9] PCI: consolidate PCI config entry in drivers/pci

On Fri, Oct 19, 2018 at 9:23 PM Russell King - ARM Linux
<linux@...linux.org.uk> wrote:

> > index a68b34183107..b185794549be 100644
> > --- a/arch/arm/mach-pxa/Kconfig
> > +++ b/arch/arm/mach-pxa/Kconfig
> > @@ -125,7 +125,7 @@ config MACH_ARMCORE
> >       bool "CompuLab CM-X255/CM-X270 modules"
> >       select ARCH_HAS_DMA_SET_COHERENT_MASK if PCI
> >       select IWMMXT
> > -     select MIGHT_HAVE_PCI
> > +     select HAVE_PCI
> >       select NEED_MACH_IO_H if PCI
> >       select PXA25x
> >       select PXA27x
>
> This is wrong.  "MIGHT_HAVE_PCI" is _not_ the same as "HAVE_PCI" - we
> have a bunch of platforms that mandatorily have PCI and these select
> PCI directly.  "MIGHT_HAVE_PCI" controls the _visibility_ of the PCI
> menu option, but does not prevent it being selected.  Your patch will
> cause Kconfig to complain for those which mandatorily have PCI but
> do not set HAVE_PCI.


Good catch!
But, adding a bunch of 'select HAVE_PCI' along with 'select PCI' is ugly.

Do you have any suggestion?

How about letting CONFIG_ARM to select HAVE_PCI ?

-- 
Best Regards
Masahiro Yamada