From patchwork Wed Feb 26 22:27:22 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: 11407391 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 135BA92A for ; Wed, 26 Feb 2020 22:25:33 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E4DF224656 for ; Wed, 26 Feb 2020 22:25:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="pax5kYTP"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="j6tNkmTK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E4DF224656 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=embeddedor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Subject:To:From :Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=i2GZLqVy+p6fu32guZxSapvbXzBGUrkDKFsr2lajbFM=; b=pax5kYTPAcqtqx ZR5EFmeU/4OaUaY7slXrzoCjWh5vdOcBZBgR1XHrHnflkC3Aa1DU5JE0/EHU9x+Lw7qagAAO1dfFt K8ePpFlBXLeUyOXEBsVHuiurDJONBwdv/Z+qTYIhb5AAVy9E7dWcYW9w3O+pJZ2hPSUe71DLLa2fw MGpEEnGFuXnJeNxL9nmkjHOTQXIhvMQVsKCo70c1QjH+if5EHW92nJKZmO6FjmFtFB8/XNYHnj8U6 Znc59Lv9hdeX+bBT+cs68uBN2do7mIZZYzFgaRkrjfjrhALWsERvsoqOgdkMK+OTCPgKfMIK5Dp3S uu3DK8ntEhV3uDljMpRA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j757T-0005be-97; Wed, 26 Feb 2020 22:25:31 +0000 Received: from gateway31.websitewelcome.com ([192.185.143.31]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j757G-0005On-I3 for linux-mediatek@lists.infradead.org; Wed, 26 Feb 2020 22:25:21 +0000 Received: from cm13.websitewelcome.com (cm13.websitewelcome.com [100.42.49.6]) by gateway31.websitewelcome.com (Postfix) with ESMTP id A32F3556B83 for ; Wed, 26 Feb 2020 16:25:17 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 757FjaAOwRP4z757FjystY; Wed, 26 Feb 2020 16:25:17 -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=RglIhNKe9o3UQdqr70qs4toIodilo8e4AyccNifDDhg=; b=j6tNkmTKdi+KNfcv3JQnjCHx31 pe6sjGT5wtfo98lm/ZAeFDxsi4cjUK0uyRCxVLwy/ZpoQ8d6a1a1vlSJUh9/CEc8KucBQd1/rk+WZ zNtIGWedbmfjyUh0xyfgkQxrwgjxoO/9wHaGXAfZVJZTcVyQ6AU49O5xr/5hiuhhVgEJ3l1DOZ+zj wo6LzJISuM/Aj+yYP6MqCw5rSiDSxEuLD2MUCkajNLQorl27IeDOrvRhvwhXldAMgeo9020uiXCVK ioVRL6WUQLEVmmBQiqoRbib2R9a4ug8ou4/rCpsPON2Mjy5osCHcXDcu9fn0mAhjJHJmpaQ5LNpOZ Eenij2DQ==; Received: from [200.39.29.168] (port=50390 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j757C-001KJu-D2; Wed, 26 Feb 2020 16:25:15 -0600 Date: Wed, 26 Feb 2020 16:27:22 -0600 From: "Gustavo A. R. Silva" To: Masahiro Yamada , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Liang Yang , Kevin Hilman , Xiaolei Li , Matthias Brugger , Maxime Ripard , Chen-Yu Tsai Subject: [PATCH] mtd: rawnand: Replace zero-length array with flexible-array member Message-ID: <20200226222722.GA18020@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 - lists.infradead.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 200.39.29.168 X-Source-L: No X-Exim-ID: 1j757C-001KJu-D2 X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [200.39.29.168]:50390 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 25 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200226_142518_709095_DE83EF0B X-CRM114-Status: UNSURE ( 7.13 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [192.185.143.31 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Gustavo A. R. Silva" , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-mtd@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.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 inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] 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 Acked-by: Masahiro Yamada --- drivers/mtd/nand/raw/denali.h | 2 +- drivers/mtd/nand/raw/marvell_nand.c | 2 +- drivers/mtd/nand/raw/meson_nand.c | 2 +- drivers/mtd/nand/raw/mtk_nand.c | 2 +- drivers/mtd/nand/raw/nand_hynix.c | 2 +- drivers/mtd/nand/raw/sunxi_nand.c | 2 +- 6 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/mtd/nand/raw/denali.h b/drivers/mtd/nand/raw/denali.h index e5cdcda56d14..ac46eb7956ce 100644 --- a/drivers/mtd/nand/raw/denali.h +++ b/drivers/mtd/nand/raw/denali.h @@ -328,7 +328,7 @@ struct denali_chip { struct nand_chip chip; struct list_head node; unsigned int nsels; - struct denali_chip_sel sels[0]; + struct denali_chip_sel sels[]; }; /** diff --git a/drivers/mtd/nand/raw/marvell_nand.c b/drivers/mtd/nand/raw/marvell_nand.c index fb5abdcfb007..7082bef1c8a7 100644 --- a/drivers/mtd/nand/raw/marvell_nand.c +++ b/drivers/mtd/nand/raw/marvell_nand.c @@ -334,7 +334,7 @@ struct marvell_nand_chip { int addr_cyc; int selected_die; unsigned int nsels; - struct marvell_nand_chip_sel sels[0]; + struct marvell_nand_chip_sel sels[]; }; static inline struct marvell_nand_chip *to_marvell_nand(struct nand_chip *chip) diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c index 9f17b5b8efbf..f6fb5c0e6255 100644 --- a/drivers/mtd/nand/raw/meson_nand.c +++ b/drivers/mtd/nand/raw/meson_nand.c @@ -118,7 +118,7 @@ struct meson_nfc_nand_chip { u8 *data_buf; __le64 *info_buf; u32 nsels; - u8 sels[0]; + u8 sels[]; }; struct meson_nand_ecc { diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c index b8305e39ab51..ef149e8b26d0 100644 --- a/drivers/mtd/nand/raw/mtk_nand.c +++ b/drivers/mtd/nand/raw/mtk_nand.c @@ -131,7 +131,7 @@ struct mtk_nfc_nand_chip { u32 spare_per_sector; int nsels; - u8 sels[0]; + u8 sels[]; /* nothing after this field */ }; diff --git a/drivers/mtd/nand/raw/nand_hynix.c b/drivers/mtd/nand/raw/nand_hynix.c index 194e4227aefe..7caedaa5b9e5 100644 --- a/drivers/mtd/nand/raw/nand_hynix.c +++ b/drivers/mtd/nand/raw/nand_hynix.c @@ -26,7 +26,7 @@ struct hynix_read_retry { int nregs; const u8 *regs; - u8 values[0]; + u8 values[]; }; /** diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c index 37a4ac0dd85b..6ede3934a5f4 100644 --- a/drivers/mtd/nand/raw/sunxi_nand.c +++ b/drivers/mtd/nand/raw/sunxi_nand.c @@ -195,7 +195,7 @@ struct sunxi_nand_chip { u32 timing_cfg; u32 timing_ctl; int nsels; - struct sunxi_nand_chip_sel sels[0]; + struct sunxi_nand_chip_sel sels[]; }; static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand)