From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14CF7C433E1 for ; Wed, 22 Jul 2020 06:24:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9AA020792 for ; Wed, 22 Jul 2020 06:24:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728639AbgGVGYZ (ORCPT ); Wed, 22 Jul 2020 02:24:25 -0400 Received: from mail3-relais-sop.national.inria.fr ([192.134.164.104]:5188 "EHLO mail3-relais-sop.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726147AbgGVGYZ (ORCPT ); Wed, 22 Jul 2020 02:24:25 -0400 X-IronPort-AV: E=Sophos;i="5.75,381,1589234400"; d="scan'208";a="354992183" Received: from abo-173-121-68.mrs.modulonet.fr (HELO hadrien) ([85.68.121.173]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Jul 2020 08:24:23 +0200 Date: Wed, 22 Jul 2020 08:24:22 +0200 (CEST) From: Julia Lawall X-X-Sender: jll@hadrien To: Markus Elfring cc: Denis Efremov , Coccinelle , Gilles Muller , Masahiro Yamada , Michal Marek , Nicolas Palix , linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user() In-Reply-To: <07a06754-94dd-60b1-1ad1-9e602c86b1f8@web.de> Message-ID: References: <0b326e2b-723c-3482-c0ef-5d6592a9c6cb@web.de> <07a06754-94dd-60b1-1ad1-9e602c86b1f8@web.de> User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 22 Jul 2020, Markus Elfring wrote: > > Markus, you are welcome to try this since you are concerned about it. > > I dare to point software design variations for some reasons. > > > > But it doesn't matter. > > Under which circumstances would you begin to care more for involved differences > in corresponding run time characteristics? When the difference is hours vs seconds. In this case, there are tradeoffs between the two options, andI don't know which would be faster, but I think it is extremely unlikely that the difference is noticible. But if you are concerned about it, you are welcome to try. julia