linux-kernel - Re: [PATCH V2 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI

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Date:	Tue, 22 Dec 2015 09:34:00 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	bhelgaas@...gle.com, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rjw@...ysocki.net, hanjun.guo@...aro.org,
	Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
	jiang.liu@...ux.intel.com, robert.richter@...iumnetworks.com,
	mw@...ihalf.com, Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	tglx@...utronix.de, wangyijing@...wei.com,
	Suravee.Suthikulpanit@....com, msalter@...hat.com,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org, jchandra@...adcom.com,
	jcm@...hat.com, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH V2 06/23] XEN / PCI: Remove the dependence on arch x86
 when PCI_MMCONFIG=y

On 21.12.2015 19:12, Stefano Stabellini wrote:
> On Wed, 16 Dec 2015, Tomasz Nowicki wrote:
>> In drivers/xen/pci.c, there are arch x86 dependent codes when
>> CONFIG_PCI_MMCONFIG is enabled, since CONFIG_PCI_MMCONFIG
>> depends on ACPI, so this will prevent XEN PCI running on other
>> architectures using ACPI with PCI_MMCONFIG enabled (such as ARM64).
>>
>> Fortunatly, it can be sloved in a simple way. In drivers/xen/pci.c,
>> the only x86 dependent code is if ((pci_probe & PCI_PROBE_MMCONF) == 0),
>> and it's defined in asm/pci_x86.h, the code means that
>> if the PCI resource is not probed in PCI_PROBE_MMCONF way, just
>> ingnore the xen mcfg init. Actually this is duplicate, because
>> if PCI resource is not probed in PCI_PROBE_MMCONF way, the
>> pci_mmconfig_list will be empty, and the if (list_empty())
>> after it will do the same job.
>>
>> So just remove the arch related code and the head file, this
>> will be no functional change for x86, and also makes xen/pci.c
>> usable for other architectures.
>>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>> CC: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>> Cc: Stefano Stabellini <Stefano.Stabellini@...citrix.com>
>> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>
> Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
>

Thanks Stefano.

Tomasz
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