From nobody Mon Oct 6 08:08:21 2025 Received: from szxga06-in.huawei.com (szxga06-in.huawei.com [45.249.212.32]) (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 2FCCA27144C for ; Thu, 24 Jul 2025 08:56:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753347374; cv=none; b=H0ONYO8t2mCi383i046eTsZlwDr79D/10aWebQ+tTX18HOncMoLEd4phNpr6IyzDxv0gzirUOnmJQudFg2RSeC8w9m+1Z+zXGS2JVqMij5kKH4PVTX6LuJTDET0LKa3kXkQZIjhjsS1kGpB07E0zB2RgrfE1AW2Xd1sHJu+e8PE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753347374; c=relaxed/simple; bh=LviThTNa7WFSySQCtkVWg9h/yH8uPysYxenL5Gkm01I=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=AWIuax/fEfCE3nZKX4/epUYa++si6+e2LV9ZXyun8XXE3/VqQ4g9buFPLZC8fg3LmzGaE0AfdMr6T13IRSOJkDQZmbQVixugPGNz8cCNdD+bhaaTy3UQprEylBfV9mc5r/W1SkH1nUQQ2MdCPZrX0QlZNPPsCtkb/SXeqNdAquk= 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=45.249.212.32 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 [172.19.88.214]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4bnlHg1L12z27j13; Thu, 24 Jul 2025 16:57:03 +0800 (CST) Received: from kwepemj200003.china.huawei.com (unknown [7.202.194.15]) by mail.maildlp.com (Postfix) with ESMTPS id B92011A016C; Thu, 24 Jul 2025 16:56:02 +0800 (CST) Received: from localhost.huawei.com (10.90.31.46) 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; Thu, 24 Jul 2025 16:56:02 +0800 From: Qinxin Xia To: <21cnbao@gmail.com>, , , CC: , , , , Subject: [PATCH 2/2] dma-mapping: benchmark: Add padding to ensure uABI remained consistent Date: Thu, 24 Jul 2025 16:56:00 +0800 Message-ID: <20250724085600.4101321-3-xiaqinxin@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250724085600.4101321-1-xiaqinxin@huawei.com> References: <20250724085600.4101321-1-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: kwepems500001.china.huawei.com (7.221.188.70) 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