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

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* que: How can we Eliminate the DMA Zone from the kernel?
@ 2007-01-25 12:56 Seetharam Dharmosoth
  2007-01-25 15:35 ` Kyle McMartin
  0 siblings, 1 reply; 3+ messages in thread
From: Seetharam Dharmosoth @ 2007-01-25 12:56 UTC (permalink / raw)
  To: Randy Dunlap; +Cc: linux-kernel

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)

Can you please give me suggestions in this regards.

Thanks
RAM

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: que: How can we Eliminate the DMA Zone from the kernel?
  2007-01-25 12:56 que: How can we Eliminate the DMA Zone from the kernel? Seetharam Dharmosoth
@ 2007-01-25 15:35 ` Kyle McMartin
  2007-01-25 19:33   ` Randy Dunlap
  0 siblings, 1 reply; 3+ messages in thread
From: Kyle McMartin @ 2007-01-25 15:35 UTC (permalink / raw)
  To: Seetharam Dharmosoth; +Cc: Randy Dunlap, linux-kernel

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.)

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: que: How can we Eliminate the DMA Zone from the kernel?
  2007-01-25 15:35 ` Kyle McMartin
@ 2007-01-25 19:33   ` Randy Dunlap
  0 siblings, 0 replies; 3+ messages in thread
From: Randy Dunlap @ 2007-01-25 19:33 UTC (permalink / raw)
  To: Kyle McMartin; +Cc: Seetharam Dharmosoth, linux-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

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2007-01-25 19:38 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2007-01-25 12:56 que: How can we Eliminate the DMA Zone from the kernel? Seetharam Dharmosoth
2007-01-25 15:35 ` Kyle McMartin
2007-01-25 19:33   ` Randy Dunlap

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