Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757987Ab1EYOOq (ORCPT ); Wed, 25 May 2011 10:14:46 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:36104 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757794Ab1EYOOp (ORCPT ); Wed, 25 May 2011 10:14:45 -0400 Date: Wed, 25 May 2011 16:14:31 +0200 From: Ingo Molnar To: Dan Rosenberg Cc: "H. Peter Anvin" , Tony Luck , linux-kernel@vger.kernel.org, davej@redhat.com, kees.cook@canonical.com, davem@davemloft.net, eranian@google.com, torvalds@linux-foundation.org, adobriyan@gmail.com, penberg@kernel.org, Arjan van de Ven , Andrew Morton , Valdis.Kletnieks@vt.edu, pageexec@freemail.hu Subject: Re: [RFC][PATCH] Randomize kernel base address on boot Message-ID: <20110525141431.GF19118@elte.hu> References: <1306269105.21443.20.camel@dan> <20110524211644.GJ27634@elte.hu> <4DDC39F1.2060903@zytor.com> <1306332225.2211.9.camel@dan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1306332225.2211.9.camel@dan> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 837 Lines: 23 * Dan Rosenberg wrote: > I'm going to continue to enforce the requirement that 16 MB is the > lowest address we can safely load the kernel, and I'd still > appreciate any information on why 2/4 MB default alignment might > cause problems. The 16 MB limit is more about preserving 24-bit addressable memory than about safety: it is a useful resource to certain physical devices and we do not want to reduce that resource by ~12.5% by putting a ~2MB kernel image into it. But yes, we want to load above 16 MB, if RAM size makes it possible. Thanks, Ingo -- 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/