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Date: Tue, 29 May 2012 10:56:45 -0700
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Subject: Re: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first
From: Yinghai Lu <yinghai@kernel.org>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Steven Newbury <steve@snewbury.org.uk>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org
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On Sat, May 26, 2012 at 8:01 AM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> Another bug here: we're trying to restrict the *bus* addresses we
> allocate, but we're applying the limits to *CPU* addresses.
> Therefore, this only works as intended when CPU addresses are the same
> as bus addresses, i.e., when the host bridge applies no address
> translation.  That happens to be the case for x86, but is not the case
> in general.
>
> I think we need a third patch to fix this problem.

yes.