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=-7.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 5B2EAC43387 for ; Mon, 7 Jan 2019 12:42:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1CBAB2177B for ; Mon, 7 Jan 2019 12:42:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864949; bh=3Kv8Hca8SVuTNNHBP4DpRkWak9TZX0b+v7Y2EhG6ahs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=vXOSFGRHjFWJoR1RoPjVPDtnnO+K/WTNpZlOjq3dkzdDMVo++aEQkdKhxMsog4g6X nxz8dgLn+4Aui/Z9i3Cf4V/2bnqXsJ2q9pN/oT1zkV1oDFF+Z690wdbiaRH79sYoUG 5SGbHFNDtxzcMG0yF/5naJA+lJpCv2RwaSaxtVws= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728282AbfAGMm2 (ORCPT ); Mon, 7 Jan 2019 07:42:28 -0500 Received: from mail.kernel.org ([198.145.29.99]:58090 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728261AbfAGMmY (ORCPT ); Mon, 7 Jan 2019 07:42:24 -0500 Received: from localhost (unknown [171.76.109.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3DD3B20665; Mon, 7 Jan 2019 12:42:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864944; bh=3Kv8Hca8SVuTNNHBP4DpRkWak9TZX0b+v7Y2EhG6ahs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LrWpanJ+iGgggXIF0T3AjWWvorzbkJCdXp0AF9M8Bg2D+cfO+KvIUZMoQlTSaOHEc u7+hzWSzwrxxgwRNyoR/DploAin21i8Go04iOJ4A39Ga25yqMccvYUq8p/ENyjAtyb SnVEs1VpljYc6zOT3Qykto9iYnWysfyag0LDF5y0= Date: Mon, 7 Jan 2019 18:10:52 +0530 From: Vinod Koul To: "Gustavo A. R. Silva" Cc: Laxman Dewangan , Jon Hunter , Dan Williams , Thierry Reding , dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] dmaengine: tegra-apb: Use struct_size() in devm_kzalloc() Message-ID: <20190107124052.GJ13372@vkoul-mobl.Dlink> References: <20190104211612.GA14300@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190104211612.GA14300@embeddedor> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04-01-19, 15:16, Gustavo A. R. Silva wrote: > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > void *entry[]; > }; > > instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL); > > This code was detected with the help of Coccinelle. Applied, thanks -- ~Vinod