DaveM> I know pci_map_single (and _sg) will use bounce buffers on
DaveM> platforms without an IOMMU,
DaveM> 64-bit platforms without IOMMU use HIGHMEM.
Not true for ia64 linux.
DaveM> It could for example be solved with a GFP_32BIT flag or
DaveM> something (on IA64 I know GFP_DMA is used in
DaveM> pci_alloc_consistent() to get memory below 4GB but that can't
DaveM> be used on all platforms).
DaveM> IA64 was broken, it now uses HIGHMEM.
No it doesn't. Perhaps you meant to say that the Red Hat version of
the ia64 linux kernel uses highmem?
--david
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