> A problem arises on 64 bit platforms (such as IA64) if your PCI card is only 32bit
>(can
> address the first 4G) and you don't wan't to use bounce buffers. If you use GFP_DMA
>on
GFP_DMA is ISA dma reachable, Forget the IA64, their setup is weird and
should best be ignored until 2.5 as and when they sort it out.
> bounce buffers are needed. On Alpha GFP_DMA is not limited at all (I think). Correct
>me if
Alpha has various IOMMU facilities
> I'm wrong, but I really think there should be a general way of allocating memory
>that is
> 32bit addressable (something like GFP_32BIT?) so you don't need a lot of #ifdef's in
>your
> code.
No ifdefs are needed
GFP_DMA - ISA dma reachable
pci_alloc_* and friends - PCI usable memory
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