From patchwork Tue Feb 11 21:02:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 1236511 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=embeddedor.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=embeddedor.com header.i=@embeddedor.com header.a=rsa-sha256 header.s=default header.b=ptfWdyKQ; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48HGXY5pnKz9sP7 for ; Wed, 12 Feb 2020 08:45:17 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727052AbgBKVpQ (ORCPT ); Tue, 11 Feb 2020 16:45:16 -0500 Received: from gateway32.websitewelcome.com ([192.185.145.114]:33044 "EHLO gateway32.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727414AbgBKVpQ (ORCPT ); Tue, 11 Feb 2020 16:45:16 -0500 X-Greylist: delayed 2736 seconds by postgrey-1.27 at vger.kernel.org; Tue, 11 Feb 2020 16:45:16 EST Received: from cm17.websitewelcome.com (cm17.websitewelcome.com [100.42.49.20]) by gateway32.websitewelcome.com (Postfix) with ESMTP id BE6034432C for ; Tue, 11 Feb 2020 14:59:39 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 1cd9jhVtyAGTX1cd9jtuIl; Tue, 11 Feb 2020 14:59:39 -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=IPGuh4dJHUV6jC0H2DD+K0aSPx7nJ/9fjrtidfPd1Bo=; b=ptfWdyKQkcSnaRqzN+e9PKQsaX PPFAU0pL1ijbOVJOaG+VQ9CmQM5Nn7elVWMpJG85ynyd5YUrrl5k2BsE7P5hs7bu8CwDooXCc89cS 6EUPU/QWQzTRz9KDlDVbRsQ0dmfSfrR78U3FzVB+R+d0VFN9ujMMFuDbfUV8BsB5aWk4PPJaLM7XH FQPfJcURpt7gBQPW19Qbjl67vF/qLD93y/mZzzgylkiuCmvEspEIcjd3pBijTA3zDKVip4eMIYRZ/ tq7m7gTMz2kjNVpvot9lsPl0kQYgxw8iCK5Wb0wQaUgru3rm3mgclfD7PoEaRmbkrnKLv5pPuXkoN /LD6H8yQ==; Received: from [200.68.140.36] (port=14955 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j1cd8-0022a3-9c; Tue, 11 Feb 2020 14:59:38 -0600 Date: Tue, 11 Feb 2020 15:02:13 -0600 From: "Gustavo A. R. Silva" To: Russell King , Thierry Reding , Jonathan Hunter Cc: linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] amba: tegra-ahb: Replace zero-length array with flexible-array member Message-ID: <20200211210213.GA28043@embeddedor> MIME-Version: 1.0 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: 1j1cd8-0022a3-9c X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [200.68.140.36]:14955 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 53 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@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. [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/amba/tegra-ahb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c index b0b688c481e8..e9e5c7bb580c 100644 --- a/drivers/amba/tegra-ahb.c +++ b/drivers/amba/tegra-ahb.c @@ -129,7 +129,7 @@ static const u32 tegra_ahb_gizmo[] = { struct tegra_ahb { void __iomem *regs; struct device *dev; - u32 ctx[0]; + u32 ctx[]; }; static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)