Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755957AbYHHABU (ORCPT ); Thu, 7 Aug 2008 20:01:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753486AbYHHABM (ORCPT ); Thu, 7 Aug 2008 20:01:12 -0400 Received: from an-out-0708.google.com ([209.85.132.251]:18063 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753430AbYHHABL (ORCPT ); Thu, 7 Aug 2008 20:01:11 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=UvgaqrbbkHeOC/094pV7xegzwqj7g2UVwQuOssPa5dcLUqcTSiEVLbSFaALdkYdD07 3hlD9g8ecMCKmRhkff7oLE9+InchergC1eMoD42rERhMux+niuZptgvbEmGY/vlCSuwM ToRdDz2B8SOVqP4Gssl9ccqybvVCOW6lFArdE= Message-ID: <86802c440808071701j4ebdc15u16e8d0e77b945c2f@mail.gmail.com> Date: Thu, 7 Aug 2008 17:01:10 -0700 From: "Yinghai Lu" To: "H. Peter Anvin" Subject: Re: [PATCH]Fix broken VMI in 2.6.27-rc.. Cc: "Jeremy Fitzhardinge" , "Zachary Amsden" , "Alok Kataria" , "torvalds@linux-foundation.org" , "Ingo Molnar" , "the arch/x86 maintainers" , LKML In-Reply-To: <489B8A68.10900@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <1218136365.23770.52.camel@alok-dev1> <489B6710.9000604@kernel.org> <1218144438.20178.336.camel@bodhitayantram.eng.vmware.com> <489B836A.3050209@goop.org> <489B84EF.6050009@kernel.org> <489B8948.6060003@goop.org> <489B8A68.10900@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1235 Lines: 32 On Thu, Aug 7, 2008 at 4:51 PM, H. Peter Anvin wrote: > Jeremy Fitzhardinge wrote: >> >> H. Peter Anvin wrote: >>> >>> The fixmap area should never have been made movable. It's utter >>> braindamage. >> >> Shrug. It's been like that for a couple of years now. It was one of the >> very first paravirt-ops patches. It wasn't controversial then, and nobody >> seems to have noticed since. > > The Linux kernel was never a paragon of perfection - it was never meant to > be. Just because a bit of cruft went unnoticed into the kernel doesn't mean > we shouldn't fix it. > >>> Given the x86 architecture, it's inevitable that PV will want to reserve >>> address space at the top of memory, and therefore the fixmap area needs to >>> be moved out of that space. >> >> OK. But there's a few places where the code uses FIXADDR_TOP to mean "top >> of kernel address space", so we'd need to come up with a proper symbol for >> that. why not reserving that in e820 table? YH -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/