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

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Message-ID: <20140924171047.GO15842@e104818-lin.cambridge.arm.com>
Date:	Wed, 24 Sep 2014 18:10:48 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Robert Richter <robert.richter@...iumnetworks.com>
Cc:	Arnd Bergmann <arnd@...db.de>, 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 Wed, Sep 24, 2014 at 05:26:31PM +0100, Robert Richter wrote:
> 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.

It may be better to simply set PCI and PCI_MSI as defaults in defconfig
rather than "default y" and an additional config PCI_MSI entry.

-- 
Catalin
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