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=-3.6 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 16F67C61CE4 for ; Sun, 20 Jan 2019 05:23:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D27732085B for ; Sun, 20 Jan 2019 05:23:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547961817; bh=3DdBv8T1XZjd63F7p9OoILoZYiEEU5Jq1ddcvLGMq1w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=xQHw58vZn/h6iQlSNIio0lKpQKbyhN8ZG1QmRIg1d+xcldOvzKNz6cN57PGHN/DTn VTPefUaZcjQwrbJCBGFPL3gmX3KSilJZyW0oZYReD/fXHvRvgLsSDwOcv3luMGYse4 oZ0LCvR0YjZI0EFet7ffi0jtVd2YOjCdPUdQdTjQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727227AbfATFXg (ORCPT ); Sun, 20 Jan 2019 00:23:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:53830 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725923AbfATFXf (ORCPT ); Sun, 20 Jan 2019 00:23:35 -0500 Received: from localhost (unknown [122.178.235.99]) (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 28F612084A; Sun, 20 Jan 2019 05:23:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547961815; bh=3DdBv8T1XZjd63F7p9OoILoZYiEEU5Jq1ddcvLGMq1w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=AE2k0Sf0UoETWDXP++0j1/1gO4E3OPAAFpJIQManlI9pv3TKqIzkgw118pWMsNi9f 7JJN88EHDBDtSuE9YQpgxVM83zlFWPYiRKHWZmWKo3UuRzOJd3gOnScSTk3N2Uz4PZ s0dhtRYfC2B3KmXo/RaBGiawSkq60BOBr5PzIx0s= Date: Sun, 20 Jan 2019 10:52:01 +0530 From: Vinod Koul To: "Gustavo A. R. Silva" Cc: Lars-Peter Clausen , Dan Williams , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] dmaengine: axi-dmac: Use struct_size() in kzalloc() Message-ID: <20190120052201.GL4635@vkoul-mobl> References: <20190109144437.GA10733@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190109144437.GA10733@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 09-01-19, 08:44, 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