From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934907AbXGSIhA (ORCPT ); Thu, 19 Jul 2007 04:37:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757053AbXGSIgv (ORCPT ); Thu, 19 Jul 2007 04:36:51 -0400 Received: from smtp2.linux-foundation.org ([207.189.120.14]:44271 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755321AbXGSIgu (ORCPT ); Thu, 19 Jul 2007 04:36:50 -0400 Date: Thu, 19 Jul 2007 01:36:15 -0700 From: Andrew Morton To: Dave Airlie Cc: linux-kernel@vger.kernel.org Subject: Re: cmpxchg is not available to generic code Message-Id: <20070719013615.948c52d6.akpm@linux-foundation.org> In-Reply-To: References: <20070719000549.1e57b5b2.akpm@linux-foundation.org> <20070719011055.1392c7d2.akpm@linux-foundation.org> X-Mailer: Sylpheed 2.4.1 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 19 Jul 2007 09:19:10 +0100 (IST) Dave Airlie wrote: > > > >> they need to grow a userpsace > >> cmpxchg as davem mentioned to go along with this, changing the drm now > >> isn't possible due to backwards compat.. > > > > For reference purposes, that position is not acceptable. We _never_ accept the > > "oh I can't change my proposed kernel interface because I already have > > userspace relying on it" argument. > > Yes it is, I thought breaking userspace API was the worst crime in kernel > history, (unless you are sysfs...) the userspace DRM has been around since > 2.2 days at least, so there are lots of legacy userspaces to break.. oh, sorry, I thought this cmpxchg stuff was newly-added. I guess something changed which has now made DRM available under arm allmodconfig.