linux-kernel - [PATCH v3 1/4] dma-mapping: benchmark: Add padding to ensure uABI remained consistent

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Message-ID: <20250509020238.3378396-2-xiaqinxin@huawei.com>
Date: Fri, 9 May 2025 10:02:35 +0800
From: Qinxin Xia <xiaqinxin@...wei.com>
To: <21cnbao@...il.com>, <xiaqinxin@...wei.com>
CC: <yangyicong@...wei.com>, <hch@....de>, <iommu@...ts.linux.dev>,
	<jonathan.cameron@...wei.com>, <prime.zeng@...wei.com>,
	<fanghao11@...wei.com>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...wei.com>, <stable@...r.kernel.org>
Subject: [PATCH v3 1/4] dma-mapping: benchmark: Add padding to ensure uABI remained consistent

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@...r.kernel.org
Signed-off-by: Qinxin Xia <xiaqinxin@...wei.com>
---
 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 */
-- 
2.33.0