From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Mackerras Subject: Re: MMIO and gcc re-ordering issue Date: Wed, 11 Jun 2008 15:20:28 +1000 Message-ID: <18511.24732.191606.794160@cargo.ozlabs.ibm.com> References: <1211852026.3286.36.camel@pasglop> <200806101656.51211.nickpiggin@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200806101656.51211.nickpiggin@yahoo.com.au> Sender: linux-kernel-owner@vger.kernel.org To: Nick Piggin Cc: Linus Torvalds , Matthew Wilcox , Trent Piepho , Russell King , Benjamin Herrenschmidt , David Miller , linux-arch@vger.kernel.org, scottwood@freescale.com, linuxppc-dev@ozlabs.org, alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org List-Id: linux-arch.vger.kernel.org Nick Piggin writes: > Now that doesn't leave waker ordering architectures lumped with "slow old > x86 semantics". Think of it as giving them the benefit of sharing x86 > development and testing :) Worth something, but not perhaps as much as you think, given that many x86 driver writers still don't pay much attention to making their code endian-safe and 64-bit-clean. And there are still plenty of drivers that use virt_to_bus... Paul. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org ([203.10.76.45]:46475 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753345AbYFKJGm (ORCPT ); Wed, 11 Jun 2008 05:06:42 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <18511.24732.191606.794160@cargo.ozlabs.ibm.com> Date: Wed, 11 Jun 2008 15:20:28 +1000 From: Paul Mackerras Subject: Re: MMIO and gcc re-ordering issue In-Reply-To: <200806101656.51211.nickpiggin@yahoo.com.au> References: <1211852026.3286.36.camel@pasglop> <200806101656.51211.nickpiggin@yahoo.com.au> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Nick Piggin Cc: Linus Torvalds , Matthew Wilcox , Trent Piepho , Russell King , Benjamin Herrenschmidt , David Miller , linux-arch@vger.kernel.org, scottwood@freescale.com, linuxppc-dev@ozlabs.org, alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org Message-ID: <20080611052028.x3ixsWYVWMzFY9XDEttajx1y_5XtnsoHb4AqiGL2f1w@z> Nick Piggin writes: > Now that doesn't leave waker ordering architectures lumped with "slow old > x86 semantics". Think of it as giving them the benefit of sharing x86 > development and testing :) Worth something, but not perhaps as much as you think, given that many x86 driver writers still don't pay much attention to making their code endian-safe and 64-bit-clean. And there are still plenty of drivers that use virt_to_bus... Paul.