From nobody Mon Feb 9 12:27:54 2026 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 23EBA22A81C for ; Fri, 16 May 2025 01:40:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.190 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747359647; cv=none; b=hiw4ChPBTosZu5e1QFRCKKY6XmbJnBcWJRnvZ9Rylcjs6A2xGnnqech2uUlEn13ukqTbNsIc3AIGtqXR1vLoP95+axyJ6bJxMc8VukllS1YL4EoUIsZpeRzHLMybPwCW1YTbI19RBfefp6I8Mst2bEuXak4qlp0lnoeuKJwFo0g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747359647; c=relaxed/simple; bh=LviThTNa7WFSySQCtkVWg9h/yH8uPysYxenL5Gkm01I=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=hv2NlFVp1QAL+59Pi4TGrBx/0uz+j7+hYMsk+qhQ58qPrXLm+mdp03K8ktP2Q961e5379XLfjYn3whhGa0e6LC6AKF3qn6xCy+0a535Z7Jc7PYqWjlM3fKR5sJTJRP7jh27cn0GyRK/wXhjrjLIcgsy3HVf5vv7/nHzPhSUBSI8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.190 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.17]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4Zz8s2750wz2RVYQ; Fri, 16 May 2025 09:39:50 +0800 (CST) Received: from kwepemj200003.china.huawei.com (unknown [7.202.194.15]) by mail.maildlp.com (Postfix) with ESMTPS id 85E1E1A0188; Fri, 16 May 2025 09:40:36 +0800 (CST) Received: from localhost.huawei.com (10.90.30.45) by kwepemj200003.china.huawei.com (7.202.194.15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 16 May 2025 09:40:35 +0800 From: Qinxin Xia To: <21cnbao@gmail.com>, , CC: , , , , , , , Subject: [PATCH v4 1/4] dma-mapping: benchmark: Add padding to ensure uABI remained consistent Date: Fri, 16 May 2025 09:40:31 +0800 Message-ID: <20250516014034.1577549-2-xiaqinxin@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250516014034.1577549-1-xiaqinxin@huawei.com> References: <20250516014034.1577549-1-xiaqinxin@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemj200003.china.huawei.com (7.202.194.15) Content-Type: text/plain; charset="utf-8" The padding field in the structure was previously reserved to maintain a stable interface for potential new fields, ensuring compatibility with user-space shared data structures. However,it was accidentally removed by tiantao in a prior commit, which may lead to incompatibility between user space and the kernel. This patch reinstates the padding to restore the original structure layout and preserve compatibility. Fixes: 8ddde07a3d28 ("dma-mapping: benchmark: extract a common header file = for map_benchmark definition") Cc: stable@vger.kernel.org Acked-by: Barry Song Signed-off-by: Qinxin Xia --- include/linux/map_benchmark.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/map_benchmark.h b/include/linux/map_benchmark.h index 62674c83bde4..2ac2fe52f248 100644 --- a/include/linux/map_benchmark.h +++ b/include/linux/map_benchmark.h @@ -27,5 +27,6 @@ struct map_benchmark { __u32 dma_dir; /* DMA data direction */ __u32 dma_trans_ns; /* time for DMA transmission in ns */ __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */ + __u8 expansion[76]; /* For future use */ }; #endif /* _KERNEL_DMA_BENCHMARK_H */ --=20 2.33.0