From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 17 Aug 1999 01:49:41 +0200 (CEST) From: Andrea Arcangeli Subject: Re: [bigmem-patch] 4GB with Linux on IA32 In-Reply-To: <199908162328.QAA24338@google.engr.sgi.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Kanoj Sarcar Cc: alan@lxorguk.ukuu.org.uk, torvalds@transmeta.com, sct@redhat.com, Gerhard.Wichert@pdb.siemens.de, Winfried.Gerhard@pdb.siemens.de, linux-kernel@vger.rutgers.edu, linux-mm@kvack.org List-ID: On Mon, 16 Aug 1999, Kanoj Sarcar wrote: >I was also talking about drivers which assume that all of memory is >direct mapped. For example, __va and __pa assume this. There might be >other macros/procedures which have the same assumption built in. >Basically, anything that is dependent on PAGE_OFFSET needs to be >checked. Only places that may deal with bigmem pages and the core of the kernel must be checked. I don't exclude there still something to fix (as happened with kernel/ptrace.c and /proc/*/mem) but with the current design we shouldn't need to touch the device drivers at all. The only real problem currently seems to be raw-io to me... (hints?) Andrea -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://humbolt.geo.uu.nl/Linux-MM/