Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751826AbaDQPsP (ORCPT ); Thu, 17 Apr 2014 11:48:15 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:53757 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751207AbaDQPsI (ORCPT ); Thu, 17 Apr 2014 11:48:08 -0400 Date: Thu, 17 Apr 2014 16:47:15 +0100 From: Will Deacon To: Sam Ravnborg Cc: "linux-arch@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "arnd@arndb.de" , "monstr@monstr.eu" , "dhowells@redhat.com" , "broonie@linaro.org" , "benh@kernel.crashing.org" , "peterz@infradead.org" , "paulmck@linux.vnet.ibm.com" Subject: Re: [PATCH 00/18] Cross-architecture definitions of relaxed MMIO accessors Message-ID: <20140417154714.GD30553@arm.com> References: <1397742261-15621-1-git-send-email-will.deacon@arm.com> <20140417153638.GA7317@ravnborg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140417153638.GA7317@ravnborg.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sam, On Thu, Apr 17, 2014 at 04:36:38PM +0100, Sam Ravnborg wrote: > On Thu, Apr 17, 2014 at 02:44:03PM +0100, Will Deacon wrote: > > Hello, > > > > This RFC series attempts to define a portable (i.e. cross-architecture) > > definition of the {readX,writeX}_relaxed MMIO accessor functions. These > > functions are already in widespread use amongst drivers (mainly those supporting > > devices embedded in ARM SoCs), but lack any well-defined semantics and, > > subsequently, any portable definitions to allow these drivers to be compiled for > > other architectures. > > Could this be made in such a way that only architectures that need > to provide their own versions actually have to add them? > > The current patch-set adds the same dummy defines all over, > and will put this burden also on new architectures. It shouldn't be a burden for new architectures, as they will use asm-generic/io.h and get the definitions from there. Will -- 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/