From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755946Ab1HWT12 (ORCPT ); Tue, 23 Aug 2011 15:27:28 -0400 Received: from terminus.zytor.com ([198.137.202.10]:57784 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755304Ab1HWT1Z (ORCPT ); Tue, 23 Aug 2011 15:27:25 -0400 Message-ID: <4E53FEE0.30107@zytor.com> Date: Tue, 23 Aug 2011 12:26:24 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0 MIME-Version: 1.0 To: Linus Torvalds CC: Al Viro , Andrew Lutomirski , Borislav Petkov , Ingo Molnar , "user-mode-linux-devel@lists.sourceforge.net" , Richard Weinberger , "linux-kernel@vger.kernel.org" , "mingo@redhat.com" Subject: Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) References: <4E52D280.3010107@zytor.com> <20110823000314.GW2203@ZenIV.linux.org.uk> <4E52EF2A.8060608@zytor.com> <20110823010146.GY2203@ZenIV.linux.org.uk> <20110823011312.GZ2203@ZenIV.linux.org.uk> <20110823021717.GA2203@ZenIV.linux.org.uk> <20110823061531.GC2203@ZenIV.linux.org.uk> <20110823164849.GF2203@ZenIV.linux.org.uk> <4E53FCF7.7060703@zytor.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/23/2011 12:24 PM, Linus Torvalds wrote: > On Tue, Aug 23, 2011 at 12:18 PM, H. Peter Anvin wrote: >> >> We could drop that information in a metaregister. It's not backward >> compatible, but at least it will be obvious when that information is >> available and not. > > Well, seriously, UML already looks at the word at "ip-2" for other > reasons. So it isn't like there is any point in adding more support to > just give you that information in another form. > Not for UML, but it might be useful for other things. Certainly lowers the priority, though. -hpa