Messages in this thread | | | Date | Fri, 22 Sep 2006 09:35:13 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [RFC] Initial alpha-0 for new page allocator API |
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On Fri, 22 Sep 2006, Andi Kleen wrote:
> On Friday 22 September 2006 06:02, Christoph Lameter wrote: > > We have repeatedly discussed the problems of devices having varying > > address range requirements for doing DMA. > > We already have such an API. dma_alloc_coherent(). Device drivers > are not supposed to mess with GFP_DMA* directly anymore for quite > some time.
Device drivers need to be able to indicate ranges of addresses that may be different from ZONE_DMA. This is an attempt to come up with a future scheme that does no longer rely on device drivers referring to zoies.
> > We would like for the device > > drivers to have the ability to specify exactly which address range is > > allowed. > > I actually have my doubts it is a good idea to add that now. The devices > with weird requirements are steadily going away
Hmm.... Martin?
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