linux-kernel - Re: [PATCH 5/6] arm64, defconfig: Enable PCI

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Message-ID: <21218217.YUcdQIZ4A8@wuerfel>
Date:	Thu, 25 Sep 2014 12:45:20 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Robert Richter <robert.richter@...iumnetworks.com>,
	Robert Richter <rric@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <Will.Deacon@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Sunil Goutham <sgoutham@...ium.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] arm64, defconfig: Enable PCI

On Thursday 25 September 2014 10:35:45 Catalin Marinas wrote:
> On Wed, Sep 24, 2014 at 07:40:18PM +0100, Arnd Bergmann wrote:
> > On Wednesday 24 September 2014 18:10:48 Catalin Marinas wrote:
> > > > The intention is not to have a second definition, instead this should
> > > > enable the default value just for arm64. Thus I put it to
> > > > arch/arm64/Kconfig. Otherwise it would be enabled per default on all
> > > > archs.
> > 
> > I don't think other architectures actually see the PCI symbol that is
> > defined in the arm64 Kconfig file, but I might be wrong.
> 
> Other archs wouldn't see the symbols in arch/arm64/Kconfig.

Ok.

> > > > We could have used select in config ARM64, but I tried to avoid using
> > > > select due to the dependency issue and instead implement this with
> > > > default-y/depends-on. Doing so it can be manually disabled too.
> > 
> > How about adding a new symbol like
> > 
> > config ARM64_PCI
> >       def_bool PCI
> >       select PCI_MSI
> 
> How is this different from just selecting PCI_MSI in config PCI in
> arch/arm64/Kconfig? I don't see what another symbol brings.

That suggestion was just in case I was wrong above. If the symbol
is indeed hidden elsewhere, we don't need it.

	Arnd
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