From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 11 May 2001 17:06:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 11 May 2001 17:06:42 -0400 Received: from oss.sgi.com ([216.32.174.190]:7437 "EHLO oss.sgi.com") by vger.kernel.org with ESMTP id ; Fri, 11 May 2001 17:06:35 -0400 Date: Fri, 11 May 2001 01:02:53 -0300 From: Ralf Baechle To: Alan Cox Cc: Chris Wedgwood , linux-kernel@vger.kernel.org Subject: Re: Athlon possible fixes Message-ID: <20010511010253.A1257@bacchus.dhis.org> In-Reply-To: <20010506142346.C31269@metastasis.f00f.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from alan@lxorguk.ukuu.org.uk on Sun, May 06, 2001 at 01:51:59PM +0100 X-Accept-Language: de,en,fr Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, May 06, 2001 at 01:51:59PM +0100, Alan Cox wrote: > > There really needs to be a hardware fix... this doesn't stop some > > application having it's owne optimised code from breaking on some > > hardware (think games and similation software perhaps). > > prefetch is virtually addresses. An application would need access to /dev/mem > or similar. So the only folks I think it might actually bite are the Xserver > people. Prefetch bugs in hardware have biten Linux/68k as early as '94; a GVP SCSI HBA on the Amiga may touch areas beyond the last valid RAM address when doing DMA to the last page. Being a burned child from that time Linux/MIPS didn't use the last RAM page just to be on the safe side. Ralf