linux-kernel - Re: [PATCH v5 3/3] arm64: Add architecture support for PCI

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Date:	Fri, 7 Mar 2014 01:17:46 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	"linux-pci" <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"linaro-kernel" <linaro-kernel@...ts.linaro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.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>
Subject: Re: [PATCH v5 3/3] arm64: Add architecture support for PCI

On Thursday 06 March 2014, Liviu Dudau wrote:
> On Tue, Mar 04, 2014 at 10:28:51PM +0000, Arnd Bergmann wrote:
> > On Tuesday 04 March 2014, Liviu Dudau wrote:
> > 
> > > +extern int isa_dma_bridge_buggy;
> > 
> > As commented before, I still think we can hardcode this to off
> 
> Unfortunately that doesn't work when you have CONFIG_PCI=y. drivers/pci/pci.c has:
> 
> drivers/pci/pci.c:int isa_dma_bridge_buggy;
> drivers/pci/pci.c:EXPORT_SYMBOL(isa_dma_bridge_buggy);
> 
> and drivers/pci/quirks.c does:
> 
> drivers/pci/quirks.c:   if (!isa_dma_bridge_buggy) {
> drivers/pci/quirks.c:           isa_dma_bridge_buggy=1;
> drivers/pci/quirks.c-           dev_info(&dev->dev, "Activating ISA DMA hang workarounds\n");
> drivers/pci/quirks.c-   }
> 

Ah, I see. Should we maybe move the declaration to a more generic header
file then? If the architectures cannot override it anyway, it shouldn't
be up to the architecture to declare it.

	Arnd
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