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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 416C8C433EF for ; Mon, 18 Jun 2018 20:40:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA09E20836 for ; Mon, 18 Jun 2018 20:40:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EA09E20836 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=perches.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935899AbeFRUk1 (ORCPT ); Mon, 18 Jun 2018 16:40:27 -0400 Received: from smtprelay0114.hostedemail.com ([216.40.44.114]:33972 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755326AbeFRUkZ (ORCPT ); Mon, 18 Jun 2018 16:40:25 -0400 Received: from filter.hostedemail.com (clb03-v110.bra.tucows.net [216.40.38.60]) by smtprelay06.hostedemail.com (Postfix) with ESMTP id 6737A18225645; Mon, 18 Jun 2018 20:40:24 +0000 (UTC) X-Session-Marker: 6A6F6540706572636865732E636F6D X-HE-Tag: bells69_3d6f8845e4b26 X-Filterd-Recvd-Size: 2246 Received: from XPS-9350.home (unknown [47.151.150.235]) (Authenticated sender: joe@perches.com) by omf02.hostedemail.com (Postfix) with ESMTPA; Mon, 18 Jun 2018 20:40:22 +0000 (UTC) Message-ID: <0ac0c93919e40d0c610419fa12e852e889d490e6.camel@perches.com> Subject: Re: [PATCH v2 5/5] Input: evdev - Switch to bitmap_zalloc() From: Joe Perches To: Andy Shevchenko Cc: Andy Shevchenko , Yury Norov , agk@redhat.com, Mike Snitzer , dm-devel@redhat.com, shli@kernel.org, linux-raid@vger.kernel.org, Dmitry Torokhov , linux-input , Andrew Morton , Linux Kernel Mailing List , Mika Westerberg Date: Mon, 18 Jun 2018 13:40:20 -0700 In-Reply-To: References: <20180615132017.23889-1-andriy.shevchenko@linux.intel.com> <20180615132017.23889-6-andriy.shevchenko@linux.intel.com> <20180615214231.GA371@yury-thinkpad> <0a3d86d7746792a2f848cef386941fc182653515.camel@perches.com> <8cfbdf809f531f8aa315fe1679c3273858038f41.camel@linux.intel.com> <780cba4e119110f2d2a81e237874592cff4d7868.camel@perches.com> Content-Type: text/plain; charset="ISO-8859-1" X-Mailer: Evolution 3.28.1-2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2018-06-18 at 22:56 +0300, Andy Shevchenko wrote: > On Mon, Jun 18, 2018 at 6:49 PM, Joe Perches wrote: > > Perhaps bitmap_dup_user [or some better name] could or should > > be one of the helpers. > > Can you help with estimation how many existing users need this kind of > functionality? One of them evdev, which has an open coded variant. My estimation via cocci script below is 1 existing user, so it's almost certainly not worthwhile. $ cat copy_from_user.cocci @@ unsigned long *p; expression e1, e2; @@ * copy_from_user(p, e1, e2)