Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756261AbYFOXds (ORCPT ); Sun, 15 Jun 2008 19:33:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751969AbYFOXdk (ORCPT ); Sun, 15 Jun 2008 19:33:40 -0400 Received: from kirk.serum.com.pl ([213.77.9.205]:65052 "EHLO serum.com.pl" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751644AbYFOXdj (ORCPT ); Sun, 15 Jun 2008 19:33:39 -0400 Date: Mon, 16 Jun 2008 00:31:52 +0100 (BST) From: "Maciej W. Rozycki" To: Linus Torvalds cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Adrian Bunk , Andrew Morton , Natalie Protasevich , "David S. Miller" Subject: Re: 2.6.26-rc6-git2: Reported regressions from 2.6.25 In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1731 Lines: 37 On Sat, 14 Jun 2008, Linus Torvalds wrote: > > From what you have written it looks the dependency should actually be: > > > > depends on !M386 && !M486 && !M586 && !M586TSC && !M586MMX > > > > as none of the pre-Pentium-Pro processors had the PAE feature (I am not > > sure about non-Intel implementations, so the case of M586 would have to be > > investigated). > > Yes, it's the non-intel ones that would keep me from saying !M586. > > For intel, PAE was a PPro feature (at least officially, as you point out), > but I do not know about various other manufacturers. From personal > experience, the line between Pentium and PPro features doesn't tend to be > totally black-and-white (although I suspect that when it comes to PAE it > _may_ be). Well, PAE is quite a significant block to implement and Intel kept it hidden until they published the long awaited PentiumPro manual sometime in 1996. I am fairly sure the K5 did not implement it (it may have had PSE and VME, especially in the later revisions) and Google does not show up any Cyrix processors with PAE. I may have a K5 manual somewhere, so I can see if I can verify it. Please also note these processors tried to compete with Intel on the desktop market where 4GB of RAM was completely unreasonable in late 90s. I think unless someone can recall a counter-example, it can be safely assumed these chips did not have the PAE. We could try to extend the dependency and see if anybody screams. Maciej -- 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/