Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264473AbTEJTLY (ORCPT ); Sat, 10 May 2003 15:11:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264477AbTEJTLX (ORCPT ); Sat, 10 May 2003 15:11:23 -0400 Received: from terminus.zytor.com ([63.209.29.3]:61059 "EHLO terminus.zytor.com") by vger.kernel.org with ESMTP id S264473AbTEJTLT (ORCPT ); Sat, 10 May 2003 15:11:19 -0400 Message-ID: <3EBD51C6.8030100@zytor.com> Date: Sat, 10 May 2003 12:23:50 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3b) Gecko/20030211 X-Accept-Language: en-us, en, sv MIME-Version: 1.0 To: Jamie Lokier CC: linux-kernel@vger.kernel.org Subject: Re: [PATCH] i386 uaccess to fixmap pages References: <20030509124042.GB25569@mail.jlokier.co.uk> <20030510153156.GA29271@mail.jlokier.co.uk> In-Reply-To: <20030510153156.GA29271@mail.jlokier.co.uk> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 584 Lines: 17 Jamie Lokier wrote: > > It doesn't need a PTE. The vsyscall code could be _copied_ to the end > of the page at 0xbffff000, with the stack immediately preceding it. > You don't really want that, though. If you're doing gettimeofday() in user space it's critically important that the kernel can modify all these pages at once. -hpa - 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/