Re: Does kmalloc always return address below 4GB?

[David S. Miller]

   From: Steffen Persvold <[e-mail]>
   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
[e-mail]