From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Tue, 04 Dec 2001 18:14:44 +0000 Subject: Re: [Linux-ia64] patch to no longer use ia64's software mmu Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Tue, 4 Dec 2001 18:19:55 +0000 (GMT), Alan Cox 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. --david