From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757375AbZFJSpA (ORCPT ); Wed, 10 Jun 2009 14:45:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754349AbZFJSow (ORCPT ); Wed, 10 Jun 2009 14:44:52 -0400 Received: from terminus.zytor.com ([198.137.202.10]:33027 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752965AbZFJSov (ORCPT ); Wed, 10 Jun 2009 14:44:51 -0400 Message-ID: <4A2FF1F3.9050009@zytor.com> Date: Wed, 10 Jun 2009 10:48:35 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Borislav Petkov CC: Jaswinder Singh Rajput , Andrew Morton , Ingo Molnar , x86 maintainers , LKML Subject: Re: [PATCH -tip] x86: cpu/proc.c adding extended_cpuid_level for /proc/cpuinfo References: <1242112482.3283.1.camel@localhost.localdomain> <20090512232122.61f2d7c5.akpm@linux-foundation.org> <1244227115.2507.3.camel@ht.satnam> <4A29862D.6030601@zytor.com> <1244262225.2449.22.camel@ht.satnam> <1244652044.3295.10.camel@ht.satnam> <4A2FE9E1.3020705@zytor.com> <20090610174223.GA2697@aftab> In-Reply-To: <20090610174223.GA2697@aftab> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Borislav Petkov wrote: >> >> I'm not really all that doctrinal about this, but I'd like to get a >> decent answer to the question "where does it stop, *and why*". It's a >> slippery slope, and without a target, it goes on forever. > > I still fail to see a real use case which requires adding that info to > the kernel and querying CPUID directly is _absolutely_ not an option. > This is what the decisive argument should be and not some "but we have > already this and that in there." Otherwise its like painting a broken > car pink - it's still broken. > Exactly, the question is where does it stop *and why* -- give a coherent argument why drawing a line at any one particular place makes sense. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.