Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753240AbaFPDub (ORCPT ); Sun, 15 Jun 2014 23:50:31 -0400 Received: from 216-12-86-13.cv.mvl.ntelos.net ([216.12.86.13]:57777 "EHLO brightrain.aerifal.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753185AbaFPDu1 (ORCPT ); Sun, 15 Jun 2014 23:50:27 -0400 Date: Sun, 15 Jun 2014 23:49:04 -0400 From: Rich Felker To: Andi Kleen Cc: Andy Lutomirski , "H. Peter Anvin" , Mikael Pettersson , Russ Cox , Linux API , Ian Taylor , "linux-kernel@vger.kernel.org" , X86 ML Subject: Re: [RFC 0/2] __vdso_findsym Message-ID: <20140616034904.GU179@brightrain.aerifal.cx> References: <21405.44257.742122.786960@gargle.gargle.HOWL> <20140615143500.GP179@brightrain.aerifal.cx> <539DD26B.3060709@zytor.com> <539DDE9C.3010903@zytor.com> <20140616023604.GI5714@two.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140616023604.GI5714@two.firstfloor.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 16, 2014 at 04:36:04AM +0200, Andi Kleen wrote: > > At least versioning is always useful to have, just to have > another tool for compatibility if changes are needed. I disagree. Just like syscalls, vdso functions with new APIs/ABIs should have new names. For example if a version of clock_gettime for a new userspace with 64-bit time_t is added, it should be called clock_gettime64 (with a corresponding __NR_clock_gettime64), not offered as a versioned symbol over top of the old one. The versioned symbol approach is a lot more confusing and as far as I can tell offers no benefits. Rich -- 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/