linux-kernel - Re: [PATCH v7 3/3] arm64: Add architecture support for PCI

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Message-ID: <20140317173821.GJ24070@arm.com>
Date:	Mon, 17 Mar 2014 17:38:21 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>,
	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH v7 3/3] arm64: Add architecture support for PCI

On Fri, Mar 14, 2014 at 06:05:27PM +0000, Liviu Dudau wrote:
> On Fri, Mar 14, 2014 at 05:38:08PM +0000, Arnd Bergmann wrote:
> > On Friday 14 March 2014, Catalin Marinas wrote:
> > > On Fri, Mar 14, 2014 at 03:34:18PM +0000, Liviu Dudau wrote:
> > > > --- /dev/null
> > > > +++ b/arch/arm64/kernel/pci.c
> > > [...]
> > > > +int pci_register_io_range(phys_addr_t address, resource_size_t size)
> > > [...]
> > > > +unsigned long pci_address_to_pio(phys_addr_t address)
> > > [...]
> > > > +void pcibios_fixup_bus(struct pci_bus *bus)
> > > [ actually most of this file ]
> > > 
> > > Maybe it was raised before already but can we have __weak generic
> > > definitions of these functions? They don't seem to be arm64 specific in
> > > any way.
[...]
> Catalin, if you are happy to ask for ACKs from all arch maintainers that might get
> affected by our custom version of pci_address_to_pio() before you can pull PCI support
> for arm64 then I can propose a new patchset.

You don't need to change the other architectures, that's the point of a
__weak definition, it will be automatically overridden. If you want, you
can even place a GENERIC_PCI or whatever config option that is only
selected by arm64 for the time being.

-- 
Catalin
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