Re: que: How can we Eliminate the DMA Zone from the kernel?

[Randy Dunlap <randy.dunlap@oracle.com>]

On Thu, 25 Jan 2007 10:35:10 -0500 Kyle McMartin wrote:

> On Thu, Jan 25, 2007 at 12:56:30PM +0000, Seetharam Dharmosoth wrote:
> > Hi,
> > 
> > Want to remove DMA zone the from the Linux Kernel.
> > (Don't want to use DMA Zone, because i am not
> > using ISA bus, am using PCI bus. So, I don't need
> > this)
> > 
> 
> Just because you don't need ISA, doesn't mean you don't need
> ZONE_DMA. Various PCI cards have limitations on what addresses they
> can DMA to (24 bits on some old PCI sound cards iirc, and more recently
> a 30 bit DMA limitation on some Broadcom networking equipment.)

If your platform really doesn't need ZONE_DMA, then you should
look at lots of discussion and patches on the linux-mm
mailing list.

See http://linux-mm.org/LinuxKernelMailingLists
and emails or patches from Christoph Lameter, Andi Kleen,
and Marcelo Tosatti.

---
~Randy