From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754849AbdLFKCj (ORCPT ); Wed, 6 Dec 2017 05:02:39 -0500 Received: from mx2.suse.de ([195.135.220.15]:56256 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754395AbdLFKCe (ORCPT ); Wed, 6 Dec 2017 05:02:34 -0500 Date: Wed, 6 Dec 2017 11:01:18 +0100 From: Cyril Hrubis To: John Hubbard Cc: Michal Hocko , Michael Kerrisk , linux-man , linux-api@vger.kernel.org, Michael Ellerman , linux-mm@kvack.org, LKML , linux-arch@vger.kernel.org, Jann Horn , Matthew Wilcox Subject: Re: [PATCH v2] mmap.2: MAP_FIXED updated documentation Message-ID: <20171206100118.GA13979@rei> References: <20171204021411.4786-1-jhubbard@nvidia.com> <20171204105549.GA31332@rei> <20171205070510.aojohhvixijk3i27@dhcp22.suse.cz> <2cff594a-b481-269d-dd91-ff2cc2f4100a@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2cff594a-b481-269d-dd91-ff2cc2f4100a@nvidia.com> User-Agent: Mutt/1.7.2 (2016-11-26) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > (It does seem unfortunate that the man page cannot help the programmer > actually write correct code here. He or she is forced to read the kernel > implementation, in order to figure out the true alignment rules. I was > hoping we could avoid that.) It would be nice if we had this information exported somehere so that we do not have to rely on per-architecture ifdefs. What about adding MapAligment or something similar to the /proc/meminfo? -- Cyril Hrubis chrubis@suse.cz