Messages in this thread | | | Date | Tue, 05 Mar 2002 07:47:22 -0800 (PST) | Subject | Re: Does kmalloc always return address below 4GB? | From | "David S. Miller" <> |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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