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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 76B2CC43381 for ; Tue, 19 Feb 2019 18:42:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4EBAE21479 for ; Tue, 19 Feb 2019 18:42:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728201AbfBSSmf (ORCPT ); Tue, 19 Feb 2019 13:42:35 -0500 Received: from gateway33.websitewelcome.com ([192.185.145.9]:22383 "EHLO gateway33.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726794AbfBSSmf (ORCPT ); Tue, 19 Feb 2019 13:42:35 -0500 Received: from cm17.websitewelcome.com (cm17.websitewelcome.com [100.42.49.20]) by gateway33.websitewelcome.com (Postfix) with ESMTP id 72FFE1FB60 for ; Tue, 19 Feb 2019 12:42:34 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id wALigQvUh90onwALigmyR5; Tue, 19 Feb 2019 12:42:34 -0600 X-Authority-Reason: nr=8 Received: from [189.250.119.20] (port=40816 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.91) (envelope-from ) id 1gwALh-000kxH-E4; Tue, 19 Feb 2019 12:42:33 -0600 Date: Tue, 19 Feb 2019 12:42:32 -0600 From: "Gustavo A. R. Silva" To: Rex Zhu , Evan Quan , Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , "David (ChunMing) Zhou" , David Airlie , Daniel Vetter Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] drm/amd/powerplay/smu8_hwmgr: use struct_size() in kzalloc() Message-ID: <20190219184232.GA20672@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: 189.250.119.20 X-Source-L: No X-Exim-ID: 1gwALh-000kxH-E4 X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [189.250.119.20]:40816 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 10 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 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; struct boo entry[]; }; size = sizeof(struct foo) + count * sizeof(struct boo); instance = kzalloc(size, 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); Notice that, in this case, variable table_size is not necessary, hence it is removed. This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c index 553a203ac47c..019d6a206492 100644 --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c @@ -272,12 +272,10 @@ static int smu8_init_dynamic_state_adjustment_rule_settings( struct pp_hwmgr *hwmgr, ATOM_CLK_VOLT_CAPABILITY *disp_voltage_table) { - uint32_t table_size = - sizeof(struct phm_clock_voltage_dependency_table) + - (7 * sizeof(struct phm_clock_voltage_dependency_record)); + struct phm_clock_voltage_dependency_table *table_clk_vlt; - struct phm_clock_voltage_dependency_table *table_clk_vlt = - kzalloc(table_size, GFP_KERNEL); + table_clk_vlt = kzalloc(struct_size(table_clk_vlt, entries, 7), + GFP_KERNEL); if (NULL == table_clk_vlt) { pr_err("Can not allocate memory!\n"); -- 2.20.1