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

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Date:	Wed, 24 Sep 2014 18:26:31 +0200
From:	Robert Richter <robert.richter@...iumnetworks.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Robert Richter <rric@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....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-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] arm64, defconfig: Enable PCI

On 24.09.14 18:14:11, Arnd Bergmann wrote:
> On Wednesday 24 September 2014 17:37:47 Robert Richter wrote:
> >  config PCI
> >         bool "PCI support"
> > +       default y
> >         help
> >           This feature enables support for PCIe bus system. If you say Y
> >           here, the kernel will include drivers and infrastructure code
> >           to support PCIe bus devices.
> >  
> > +config PCI_MSI
> > +       def_bool PCI
> > +
> >  config PCI_DOMAINS
> >         def_bool PCI
> 
> There is already a PCI_MSI symbol in drivers/pci/Kconfig. Just select that
> from the PCI symbol above rather than defining a second one.

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.

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.

-Robert
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