linux-kernel - Re: [PATCH 2/2] PCI: Only enable realloc auto when root bus has 64bit mmio

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Message-ID: <52A8BAC5.70006@canonical.com>
Date:	Wed, 11 Dec 2013 14:19:33 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] PCI: Only enable realloc auto when root bus has 64bit
 mmio

On 12/09/2013 03:10 PM, Yinghai Lu wrote:
> On Mon, Dec 9, 2013 at 11:42 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> That doesn't answer my question at all.
>>
>> I understand that this change makes it so Joseph doesn't have to use
>> "pci=realloc=off".  But why should auto-reallocation be limited to
>> buses that have resources above 4GB?  That doesn't make any sense.
>>
>> We should fix the reallocation code so it can deal with this case.  If
>> there's not enough space for everything, obviously we have to leave
>> something unassigned.  A ROM BAR is a good candidate for leaving
>> unassigned, because most of the time we can get along without it.
> Yes, that is ideal and not that simple.
> but that would be hard to backport to old kernels.
>
> BTW, Joseph, can you try
> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
> for-pci-3.14
> with pci=realloc=on
>
> on that system?
>
> Thanks
>
> Yinghai
I noticed there was some back and forth on this thread.  Do you still
want me to test this version, Yinghai?
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