From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.parisc-linux.org (palinux.external.hp.com [192.25.206.14]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mail.parisc-linux.org", Issuer "CAcert Class 3 Root" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 04C58DE0E3 for ; Wed, 28 May 2008 07:53:42 +1000 (EST) Date: Tue, 27 May 2008 15:53:28 -0600 From: Matthew Wilcox To: Alan Cox Subject: Re: MMIO and gcc re-ordering issue Message-ID: <20080527215328.GB22636@parisc-linux.org> References: <1211852026.3286.36.camel@pasglop> <20080526.184047.88207142.davem@davemloft.net> <1211854540.3286.42.camel@pasglop> <20080526.192812.184590464.davem@davemloft.net> <1211859542.3286.46.camel@pasglop> <1211922621.3286.80.camel@pasglop> <20080527223822.57306677@core> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20080527223822.57306677@core> Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, tpiepho@freescale.com, linuxppc-dev@ozlabs.org, scottwood@freescale.com, Linus Torvalds , David Miller List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, May 27, 2008 at 10:38:22PM +0100, Alan Cox wrote: > > re-ordering, even though I doubt it will be visible in practice. So if you > > use the "__" versions, you'd better have barriers even on x86! > > Are we also going to have __ioread*/__iowrite* ? Didn't we already define ioread*() to have loose semantics? -- Intel are signing my paycheques ... these opinions are still mine "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."