Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751217AbWCaDLG (ORCPT ); Thu, 30 Mar 2006 22:11:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751211AbWCaDLG (ORCPT ); Thu, 30 Mar 2006 22:11:06 -0500 Received: from mga03.intel.com ([143.182.124.21]:72 "EHLO azsmga101-1.ch.intel.com") by vger.kernel.org with ESMTP id S1751210AbWCaDLE (ORCPT ); Thu, 30 Mar 2006 22:11:04 -0500 X-IronPort-AV: i="4.03,148,1141632000"; d="scan'208"; a="17191312:sNHT15134021" Message-Id: <200603310311.k2V3B3g28498@unix-os.sc.intel.com> From: "Chen, Kenneth W" To: "'Christoph Lameter'" Cc: "'Nick Piggin'" , "'Zoltan Menyhart'" , "'Boehm, Hans'" , "'Grundler, Grant G'" , , , Subject: RE: Synchronizing Bit operations V2 Date: Thu, 30 Mar 2006 19:11:47 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.6353 Thread-Index: AcZUcG9WMh3BLIibTrewWhknqyBf9QAAEGzA In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 571 Lines: 12 Christoph Lameter wrote on Thursday, March 30, 2006 7:09 PM > I was referring to the LOCK prefix. Doesnt that insure the processor to > go into a special state and make the bus go into a special state that > implies a barrier? Yes, that's why on i386 both smp_mb__before_clear_bit() and smp_mb__after_clear_bit() are noop. - 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/