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 E7160C43387 for ; Mon, 7 Jan 2019 12:42:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B7DE92054F for ; Mon, 7 Jan 2019 12:42:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864934; bh=g6qmApOfWuxZmOzWFoL5wrQh6BSaCp0WHGHUMNfk714=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=Uz5jSYQFThBIBESY3Yj7ZMfY/lY3PsgEDajBg69dIxX9xRe3x1lHSj5UpUPUN9pnX ru0Mm/PbiHEJgeIveYQ3vkaEvXyZFsN4VIdgwWbbtmfd2I1N6HD5dbHLtUFPUEcMtY cnZqB3d8VdiUN94Ix2mPXVGxuG79IhaLgvRyT6Z8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728244AbfAGMmN (ORCPT ); Mon, 7 Jan 2019 07:42:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:57734 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728232AbfAGMmL (ORCPT ); Mon, 7 Jan 2019 07:42:11 -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 ED53F2070C; Mon, 7 Jan 2019 12:42:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864930; bh=g6qmApOfWuxZmOzWFoL5wrQh6BSaCp0WHGHUMNfk714=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MgZWlHfB8RDHBpvMqeWHZmc7QQzc4OU8VgOvKwnhObcnPDzJBns4Ly1bitXxlRkGG TxiIOkjLXecDAMm7AlvRnRcAo/MIDlpyUw126m+D++sZijMnOcKrstu4yZ8K6fHE6A GHDKAV9EJGadMN102BWaDsQRtWdToWEyDyoxU/g8= Date: Mon, 7 Jan 2019 18:10:34 +0530 From: Vinod Koul To: "Gustavo A. R. Silva" Cc: Dan Williams , Eric Anholt , Stefan Wahren , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, dmaengine@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] dmaengine: bcm2835: Use struct_size() in kzalloc() Message-ID: <20190107124034.GI13372@vkoul-mobl.Dlink> References: <20190104183034.GA5364@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190104183034.GA5364@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, 12:30, 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 = kzalloc(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 = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); > > This code was detected with the help of Coccinelle. Applied, thanks -- ~Vinod