From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935905AbYEBWcV (ORCPT ); Fri, 2 May 2008 18:32:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758606AbYEBWcM (ORCPT ); Fri, 2 May 2008 18:32:12 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:41145 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1758278AbYEBWcK (ORCPT ); Fri, 2 May 2008 18:32:10 -0400 Date: Fri, 02 May 2008 15:32:10 -0700 (PDT) Message-Id: <20080502.153210.122414532.davem@davemloft.net> To: Eric.Moore@lsi.com Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: HELP: Is writeq an atomic operation?? From: David Miller In-Reply-To: <0631C836DBF79F42B5A60C8C8D4E822901047B1D@NAMAIL2.ad.lsil.com> References: <0631C836DBF79F42B5A60C8C8D4E822901047B1D@NAMAIL2.ad.lsil.com> X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Moore, Eric" Date: Fri, 2 May 2008 16:19:49 -0600 > Is a 64bit write to MMIO registers an atomic operation when using the > writeq API? The answer to this question this is platform dependent. On most 64-bit platforms, it is. On some 32-bit ones, it is not. This is not a SCSI layer question, so belongs minimally on linux-kernel which I've CC:'d.