From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992878AbXDDLwl (ORCPT ); Wed, 4 Apr 2007 07:52:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992880AbXDDLwl (ORCPT ); Wed, 4 Apr 2007 07:52:41 -0400 Received: from cantor2.suse.de ([195.135.220.15]:35693 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992879AbXDDLwk (ORCPT ); Wed, 4 Apr 2007 07:52:40 -0400 From: Andi Kleen Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg) To: Samuel Thibault Subject: Re: mbind and alignment Date: Wed, 4 Apr 2007 13:52:04 +0200 User-Agent: KMail/1.9.6 Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20070402204202.GC3316@interface.famille.thibault.fr> In-Reply-To: <20070402204202.GC3316@interface.famille.thibault.fr> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200704041352.04525.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > > So one of those should probably be done to free people from headaches: > > - document "start" requirement in the manual page > - require len to be aligned too, and document the requirements in the > manual page > - drop the "start" requirement and just round down the page + adjust > size automatically. This annoyed me in the past too. The kernel should have done that alignment by itself. But changing it now would be a bad idea because it would produce programs that run on newer kernels but break on olders. Documenting it is the only sane option left. -Andi