Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760579AbYF2N3z (ORCPT ); Sun, 29 Jun 2008 09:29:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755294AbYF2N3q (ORCPT ); Sun, 29 Jun 2008 09:29:46 -0400 Received: from il.qumranet.com ([212.179.150.194]:34800 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753104AbYF2N3p (ORCPT ); Sun, 29 Jun 2008 09:29:45 -0400 Message-ID: <48678E48.8010809@qumranet.com> Date: Sun, 29 Jun 2008 16:29:44 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Andi Kleen CC: Agner Fog , Arjan van de Ven , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: ABI change for device drivers using future AVX instruction set References: <48626514.2040905@agner.org> <20080625092224.736c2541@infradead.org> <4862ECAB.1040402@zytor.com> <4864CFA5.9050901@agner.org> <20080627072231.7337ba18@infradead.org> <4865F0DA.2050906@agner.org> <87myl5pyqo.fsf@basil.nowhere.org> <4866541F.1060709@agner.org> <20080628200231.GA21259@one.firstfloor.org> <48677313.8000804@qumranet.com> <48677E39.6000001@firstfloor.org> <486780BA.6010202@qumranet.com> <486788F4.5060202@firstfloor.org> <48678BBF.80707@qumranet.com> <48678CC5.5080504@firstfloor.org> In-Reply-To: <48678CC5.5080504@firstfloor.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 844 Lines: 28 Andi Kleen wrote: >> If you use xsave, I don't see how this is different to the user fpu save >> area. >> > > For once there's no clear error handling path for allocation failures > on the (arbitarily sized) xsave state. On user code that can be barely > tolerated, but for the kernel it would be deadly. > if (kernel_fpu_begin() < 0) goto no_sse; The question is not if it can be done or not, it's whether making raid preemptible is worthwhile, and whether we see/want more sse/avx accelerated drivers or not. -- error compiling committee.c: too many arguments to function -- 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/