Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755200Ab0BHJxm (ORCPT ); Mon, 8 Feb 2010 04:53:42 -0500 Received: from casper.infradead.org ([85.118.1.10]:43355 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754550Ab0BHJxj (ORCPT ); Mon, 8 Feb 2010 04:53:39 -0500 Date: Mon, 8 Feb 2010 01:53:49 -0800 From: Arjan van de Ven To: Pavel Machek Cc: "H. Peter Anvin" , rostedt@goodmis.org, Linus Torvalds , Peter Zijlstra , Tom Tromey , Kyle Moffett , "Frank Ch. Eigler" , Oleg Nesterov , Andrew Morton , Stephen Rothwell , Fr??d??ric Weisbecker , LKML , Arnaldo Carvalho de Melo , linux-next@vger.kernel.org, utrace-devel@redhat.com, Thomas Gleixner , JimKeniston Subject: Re: linux-next: add utrace tree Message-ID: <20100208015349.36a12efe@infradead.org> In-Reply-To: <20100208065425.GB1290@ucw.cz> References: <1264575134.4283.1983.camel@laptop> <1264600792.31321.464.camel@gandalf.stny.rr.com> <4B607B1A.3080007@zytor.com> <20100208065425.GB1290@ucw.cz> Organization: Intel X-Mailer: Claws Mail 3.7.3 (GTK+ 2.16.6; i586-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1005 Lines: 25 On Mon, 8 Feb 2010 07:54:25 +0100 Pavel Machek wrote: > > No, it has nothing to do with ring. It has to do with modifying > > code that another CPU could be executing at the same time, and with > > modifying code on the same processor through another virtual alias > > (they are different issues.) The same issues apply regardless of > > the CPL of the processor. > > ...but these are always 'there could be cpu bugs around' issues, > right? Like amd k6. AFAICT x86 always supported self-modifying code > without any extra barriers needed... self modifying code yes, cross modifying code no. -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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/