linux-kernel - Re: [PATCH 0/8] PCI, ACPI, x86: Reserve fw allocated resource for hot-add root bus

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Message-ID: <CAE9FiQV5x1S1BNHrXq0wMRDx7PD5BoCh3fOnq2vS_AOAGL8Rrw@mail.gmail.com>
Date:	Tue, 8 Jan 2013 10:27:25 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	Michal Simek <monstr@...str.eu>,
	Koichi Yasutake <yasutake.koichi@...panasonic.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 0/8] PCI, ACPI, x86: Reserve fw allocated resource for
 hot-add root bus

On Tue, Jan 8, 2013 at 9:57 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> I'm really sorry that it's taken me so long to get to these.
>>
>> I applied these to my pci/yinghai-survey-resources branch.  I
>> re-ordered the last two and reworked some of the changelogs.
>
> To be clear about this, the pci/yinghai-survey-resources branch I
> mentioned is a staging branch that just gets build test coverage.  I
> don't plan to actually merge this or put it into -next until the
> questions below are resolved.
>
> My inclination, until I'm persuaded otherwise, is to wait for patches
> that preserve the similarities among these architectures.

I don't know, that could be separated patcheset after we conclude
pci root bus hotplug support.

>
>> In general these look good.  My main concern is that they only touch
>> x86, without touching the similar code in frv, microblaze, mn10300,
>> and powerpc.
>>
>> This code (pcibios_resource_survey(), pcibios_assign_resources(),
>> pcibios_allocate_resources(), pcibios_allocate_bus_resources()) was
>> obviously copied from x86 originally, and I'd like to preserve the
>> similarity between them.  It would be even better to refactor it so
>> it's actually *shared*, but I don't think that's a requirement right
>> now.

yes, should be moved to drivers/pci

>>
>> If we allow it to diverge now, it will make it harder to refactor and
>> harder to notice when bug fixes should be applied to all of them.  For
>> example, looking at pcibios_allocate_resources(), commit 575939cf5
>> added some SR-IOV support to x86.  Should similar code be added for
>> frv, microblaze, mn10300, and powerpc?

should be treated the same.

>>
>> Anybody else have thoughts on this?
>>
>> Bjorn
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