From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: pte_pagenr/MAP_NR deleted in pre6 Date: Thu, 17 Aug 2000 20:19:59 +0100 (BST) In-Reply-To: <200008171901.MAA23835@pizda.ninka.net> from "David S. Miller" at Aug 17, 2000 12:01:49 PM MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: From: Alan Cox Sender: owner-linux-mm@kvack.org Return-Path: To: "David S. Miller" Cc: kanoj@google.engr.sgi.com, sct@redhat.com, roman@augan.com, linux-mm@kvack.org, linux-kernel@vger.rutgers.edu, rmk@arm.linux.org.uk, nico@cam.org, davidm@hpl.hp.com, alan@lxorguk.ukuu.org.uk List-ID: > Whatever you do, you either have to introduce paddr_t (which to me > seems more intuitive) or page_to_pfn. We can argue one way or > another, but paddr_t might give you type checking for free too ... > > My only two gripes about paddr_t is that long long is not only > expensive but has been also known to be buggy on 32-bit platforms. Except for the x86 36bit abortion do we need a long long paddr_t on any 32bit platform ? > Which reminds me, we need to schedule a field day early 2.5.x where > virt_to_bus and bus_to_virt are exterminated, this is the only way we > can move to drivers using page+offset correctly, forcing them through > interface such as the pci_dma API instead. So you'll be adding an isa_alloc_consistant, mca_alloc_consistent, m68k_motherboard_alloc_consistent , .... And then of course I need virt_to_bus/bus_to_virt to poke at things like hardware on a PC and to access the roms. Its not trivial to exterminate. It really isnt. The PCI api is a tiny subset of uses for those functions. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/