Messages in this thread | | | From | David Mosberger <> | Date | Tue, 4 Dec 2001 10:14:44 -0800 | Subject | Re: [Linux-ia64] patch to no longer use ia64's software mmu |
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>>>>> On Tue, 4 Dec 2001 18:19:55 +0000 (GMT), Alan Cox <alan@lxorguk.ukuu.org.uk> said:
Alan> I don't see the need: GFP_DMA is the ISA DMA zone. pci_* API Alan> is used by everyone else [for 2.5]. >> Without a 4GB zone, you may end up creating bounce buffers >> needlessly for 32-bit capable DMA devices, no?
Alan> Yes - but it becomes an implementation detail. Drivers don't Alan> go around asking for kmalloc in 4Gb zone anymore they ask for Alan> PCI memory that a 32bit pci address can hit. I'm sure a 4Gb Alan> zone is what will be there internally but you don't need Alan> GFP_4GBZONE as a visible driver detail.
Oh, OK, we're in agreement then. When I looked at the zone stuff the last time, I didn't think you could have an internal 4GB zone without abusing an existing zone making some changes to the header files in linux/*.h, but perhaps I missed something.
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