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

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Message-Id: <20070125113312.830bbada.randy.dunlap@oracle.com>
Date:	Thu, 25 Jan 2007 11:33:12 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Kyle McMartin <kyle@...artin.ca>
Cc:	Seetharam Dharmosoth <seetharam_kernel@...oo.co.in>,
	linux-kernel@...r.kernel.org
Subject: Re: que: How can we Eliminate the DMA Zone from the kernel?

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
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