Re: 2.6.10-rc2-mm4

[Jes Sorensen]

>>>>> "William" == William Lee Irwin <wli@xxxxxxxxxxxxxx> 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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