From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754755AbYANTxT (ORCPT ); Mon, 14 Jan 2008 14:53:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752285AbYANTxJ (ORCPT ); Mon, 14 Jan 2008 14:53:09 -0500 Received: from gw.goop.org ([64.81.55.164]:33341 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752687AbYANTxI (ORCPT ); Mon, 14 Jan 2008 14:53:08 -0500 Message-ID: <478BBD79.1080007@goop.org> Date: Mon, 14 Jan 2008 11:52:25 -0800 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: Ingo Molnar CC: Andi Kleen , tglx@linutronix.de, linux-kernel@vger.kernel.org Subject: Re: unify pagetable accessors patch causes double fault II References: <20080114094814.GA28300@basil.nowhere.org> <20080114125638.GA9510@basil.nowhere.org> <20080114130620.GA14057@elte.hu> <20080114135811.GA16190@one.firstfloor.org> <478B9183.3020101@goop.org> <20080114165635.GK15542@elte.hu> In-Reply-To: <20080114165635.GK15542@elte.hu> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ingo Molnar wrote: > would be nice to have some debugging apparatus for bugs like this. > Perhaps artificially add a large pfn, then convert/unconvert, then > subtract it and expect the whole transformation to be an identity > mapping? This way we could simulate most of the effects of >4GB RAM, > right? Yeah, good idea. I'll code something up to run at pagetable init time or something. J