From: Steffen Persvold <sp@scali.com>
Date: Tue, 05 Mar 2002 16:43:01 +0100
"David S. Miller" wrote:
> Just use pci_alloc_consistent, it never gives you
> anything larger than 32-bit addresses, please read the
> documentation :-)
What about memory for streaming mappings
That's a different story.
I know pci_map_single (and _sg) will
use bounce buffers on platforms without an IOMMU,
64-bit platforms without IOMMU use HIGHMEM.
It could for example be solved with a GFP_32BIT flag or something (on IA64 I
know GFP_DMA is used in pci_alloc_consistent() to get memory below 4GB but that
can't be used on all platforms).
IA64 was broken, it now uses HIGHMEM.
Franks a lot,
David S. Miller
davem@redhat.com
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