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    SubjectRe: [PATCH 2/3] pci: don't assume pref memio are 64bit -v2
    On Sat, Apr 18, 2009 at 01:44:51AM -0700, Yinghai Lu wrote:
    > and BIOS set
    > [ 0.240007] pci 0000:00:01.0: bridge 64bit mmio pref: [0xbdf00000-0xddefffff]

    An obvious BIOS bug, the bridge base overlaps the physical low RAM
    (0x00000000-0xc0000000). Technically speaking, this nonsense *happens*
    to work on Intel hardware, so it seems to be quite common bug nowadays -
    BIOS writers get lost in ACPI and other "useful" stuff contradicting
    the PCI specs.

    ...

    > + /* don't allocate too high if the pref mem doesn't support 64bit*/
    > + if ((res->flags & (IORESOURCE_PREFETCH | PCI_PREF_RANGE_TYPE_64)) ==
    > + IORESOURCE_PREFETCH)
    > + max = 0xffffffff;

    This effectively destroys non-x86 64-bit arches. You've been told about
    that before, so I'm really surprised to see this "patch" once again.

    Categorically NACKed.

    P.S. I recall that I had a patch that addressed the issue, and Ingo
    made some reasonable comments about it. Will post it tomorrow.

    Ivan.


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