Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1425618AbWLHQrp (ORCPT ); Fri, 8 Dec 2006 11:47:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1425623AbWLHQrp (ORCPT ); Fri, 8 Dec 2006 11:47:45 -0500 Received: from caramon.arm.linux.org.uk ([217.147.92.249]:2169 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1425618AbWLHQro (ORCPT ); Fri, 8 Dec 2006 11:47:44 -0500 Date: Fri, 8 Dec 2006 16:47:33 +0000 From: Russell King To: Christoph Lameter Cc: Nick Piggin , David Howells , torvalds@osdl.org, akpm@osdl.org, linux-arm-kernel@lists.arm.linux.org.uk, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it Message-ID: <20061208164733.GE31068@flint.arm.linux.org.uk> Mail-Followup-To: Christoph Lameter , Nick Piggin , David Howells , torvalds@osdl.org, akpm@osdl.org, linux-arm-kernel@lists.arm.linux.org.uk, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org References: <20061206190025.GC9959@flint.arm.linux.org.uk> <20061206195820.GA15281@flint.arm.linux.org.uk> <4577DF5C.5070701@yahoo.com.au> <20061207150303.GB1255@flint.arm.linux.org.uk> <4578BD7C.4050703@yahoo.com.au> <20061208085634.GA25751@flint.arm.linux.org.uk> <20061208163127.GD31068@flint.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 875 Lines: 22 On Fri, Dec 08, 2006 at 08:43:09AM -0800, Christoph Lameter wrote: > On Fri, 8 Dec 2006, Russell King wrote: > > > You're advocating cmpxchg is adopted by all architectures. It isn't > > available on many architectures, and those which it can be requires > > unnecessarily complicated coding. > > Not having cmpxchg is even worse because it requires the introduction and > maintenance of large sets of arch specific operations. Much more complex. And which bit of "not available on many architectures" have you not grasped yet? -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: - 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/