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    SubjectRe: 2.6.10-rc2-mm4
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    >>>>> "William" == William Lee Irwin <wli@holomorphy.com> writes:

    William> On Tue, 2004-11-30 at 10:21 -0800, Andrew Morton wrote:
    >>> For pages which have a physical address <4G. I assume this was
    >>> motivated by the lack of an IOMMU on ia32e?

    William> On Tue, Nov 30, 2004 at 07:25:10PM +0100, Arjan van de Ven
    William> wrote:
    >> but there's the swiommu for those... so that can't be it
    >> realistically.... Is there code using the zone GFP mask yet ??

    William> ZONE_NORMAL and ZONE_DMA are both too overloaded to handle
    William> the 4GB boundary. And it makes a lot of sense on more machine
    William> types than x86-64 (e.g. ia64, ia32 and others with 32-bit PCI
    William> but no zone representing it).

    Hardware that doesn't require the broken 24 bit ISA zone already uses
    ZONE_DMA for all 32 bit memory - ie. ia64 does this. It works even on
    the broken-beyond-repair Intel boxes without an IOMMU.

    Cheers,
    Jes
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