Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751205Ab0GYEKA (ORCPT ); Sun, 25 Jul 2010 00:10:00 -0400 Received: from x35.xmailserver.org ([64.71.152.41]:39325 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750923Ab0GYEJ7 (ORCPT ); Sun, 25 Jul 2010 00:09:59 -0400 X-AuthUser: davidel@xmailserver.org Date: Sat, 24 Jul 2010 21:09:21 -0700 (PDT) From: Davide Libenzi X-X-Sender: davide@davide-laptop To: Andrew Morton cc: Nathan Lynch , Linux Kernel Mailing List , stable@kernel.org Subject: Re: [PATCH] signalfd: fill in ssi_int for posix timers and message queues In-Reply-To: <20100720211018.e586c7ce.akpm@linux-foundation.org> Message-ID: References: <1278117528.21917.354.camel@localhost> <20100720154205.667e95aa.akpm@linux-foundation.org> <1279683859.3030.121.camel@localhost> <20100720211018.e586c7ce.akpm@linux-foundation.org> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc 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: 883 Lines: 23 On Tue, 20 Jul 2010, Andrew Morton wrote: > It's not a matter of a current application depending on current > behaviour! The problem is that an application written in 2018 which > depends on the _new_ behaviour will not work on 2.6.34. > > It wouldn't be the worst thing we've ever done to our long-suffering > users, but it is a permanent cost of having screwed things up :( While I agree it is a problem with the kernel compatibility handling, every time we add new features to an existing interface we end up in similar scenarios. Nowadays a "require kernel >= X.Y.Z" is all but an uncommon case for userspace code. - Davide -- 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/