Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S937109AbWLFTG2 (ORCPT ); Wed, 6 Dec 2006 14:06:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760669AbWLFTG1 (ORCPT ); Wed, 6 Dec 2006 14:06:27 -0500 Received: from smtp.osdl.org ([65.172.181.25]:58200 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759338AbWLFTGZ (ORCPT ); Wed, 6 Dec 2006 14:06:25 -0500 Date: Wed, 6 Dec 2006 11:05:22 -0800 (PST) From: Linus Torvalds To: Christoph Lameter , Russell King cc: David Howells , Andrew Morton , linux-arm-kernel@lists.arm.linux.org.uk, Linux Kernel Mailing List , linux-arch@vger.kernel.org Subject: Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it In-Reply-To: Message-ID: References: <20061206164314.19870.33519.stgit@warthog.cambridge.redhat.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 813 Lines: 23 On Wed, 6 Dec 2006, Christoph Lameter wrote: > > I'd really appreciate a cmpxchg that is generically available for > all arches. It will allow lockless implementation for various performance > criticial portions of the kernel. I suspect ARM may have been the last one without one, no? That said, cmpxchg won't necessarily be "high-performance" unless the hw supports it naturally in hardware, so.. Russell, are you ok with the code DavidH posted (the "try 2" one)? I'd like to get an ack from the ARM maintainer before applying it, but it looked ok. Linus - 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/