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=-13.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 86FACC35242 for ; Tue, 11 Feb 2020 23:44:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 53E502073C for ; Tue, 11 Feb 2020 23:44:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="qD3S4rvo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728005AbgBKXoL (ORCPT ); Tue, 11 Feb 2020 18:44:11 -0500 Received: from gateway33.websitewelcome.com ([192.185.145.221]:34222 "EHLO gateway33.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727911AbgBKXoL (ORCPT ); Tue, 11 Feb 2020 18:44:11 -0500 Received: from cm13.websitewelcome.com (cm13.websitewelcome.com [100.42.49.6]) by gateway33.websitewelcome.com (Postfix) with ESMTP id 4EE1C15CDB63 for ; Tue, 11 Feb 2020 17:44:10 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 1fCMjf244RP4z1fCMj6qsN; Tue, 11 Feb 2020 17:44:10 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Type:MIME-Version:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=HuWWbn9mG6qCqANbQu9GYRVgDmlnQe5rjU+iHf/AjzI=; b=qD3S4rvooZjnwz0ZXghoPw7ZpL ngFyK6PbFW5DKFEiTRqdJF3WxsrLAJTFBKSod5A8MT6ahHCKWXh5AsWuJA1VqIcQdeuEqJ11BWW8K M7pDnGAv80xQIg3wMeazsVGLx3qOaZeP1RVOBAiU7SVlg1b11u4YAC2romgUrX3lsKTNbgtcg02ua OZ3ialpRyByBp2dNzfKBVMBmIubk3wzvJlQnXUN3UlJ5qi+YPeR5NSqsVrL+3Ws5mjZAhqiO03SUq QVzq4cQS58Ec/U866KCYtJFwY1c7qkH4PmI7NWWDYWCyZcreqrnXCE3WCP30HJLDEY8xZbuHOIW8F fq9ewb5w==; Received: from [200.68.140.36] (port=6741 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j1fBp-003k23-1O; Tue, 11 Feb 2020 17:43:37 -0600 Date: Tue, 11 Feb 2020 17:46:12 -0600 From: "Gustavo A. R. Silva" To: Support Opensource , Liam Girdwood , Mark Brown Cc: linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] regulator: da9062: Replace zero-length array with flexible-array member Message-ID: <20200211234612.GA28682@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 200.68.140.36 X-Source-L: No X-Exim-ID: 1j1fBp-003k23-1O X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [200.68.140.36]:6741 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 56 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertenly introduced[3] to the codebase from now on. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva --- drivers/regulator/da9062-regulator.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/regulator/da9062-regulator.c b/drivers/regulator/da9062-regulator.c index b064d8a19d4c..c3b6ba9bafdf 100644 --- a/drivers/regulator/da9062-regulator.c +++ b/drivers/regulator/da9062-regulator.c @@ -86,7 +86,7 @@ struct da9062_regulators { int irq_ldo_lim; unsigned n_regulators; /* Array size to be defined during init. Keep at end. */ - struct da9062_regulator regulator[0]; + struct da9062_regulator regulator[]; }; /* BUCK modes */ -- 2.25.0