lkml.org 
[lkml]   [2002]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Does kmalloc always return address below 4GB?
From
   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/

\
 
 \ /
  Last update: 2005-03-22 13:24    [W:0.047 / U:5.524 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site