From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 9 Aug 2002 05:07:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 9 Aug 2002 05:07:33 -0400 Received: from pc2-cwma1-5-cust12.swa.cable.ntl.com ([80.5.121.12]:15611 "EHLO irongate.swansea.linux.org.uk") by vger.kernel.org with ESMTP id ; Fri, 9 Aug 2002 05:07:33 -0400 Subject: Re: Patch to enable K6-2 and K6-3 processor optimizations From: Alan Cox To: David Bronaugh Cc: linux-kernel@vger.kernel.org In-Reply-To: <20020809014840.4e81fbd3.dbronaugh@linuxboxen.org> References: <20020809014840.4e81fbd3.dbronaugh@linuxboxen.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6) Date: 09 Aug 2002 11:31:19 +0100 Message-Id: <1028889079.30103.184.camel@irongate.swansea.linux.org.uk> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org We can't actually use MMX/FPU instructions in the kernel in the general case. That would require saving and restoring the user process floating point state - which is extremely expensive