linux-kernel - [PATCH v2 1/4] dma-mapping: benchmark: Add padding to ensure uABI remained consistent

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Message-ID: <20250506030100.394376-2-xiaqinxin@huawei.com>
Date: Tue, 6 May 2025 11:00:57 +0800
From: Qinxin Xia <xiaqinxin@...wei.com>
To: <baohua@...nel.org>, <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>
Subject: [PATCH v2 1/4] dma-mapping: benchmark: Add padding to ensure uABI remained consistent

Fix a problem about commit (8ddde07a3d285a0f3cec, "dma-mapping:benchmark:
extract a common header file for map_benchmark definition") accidentally
removed that padding, which has completely broken the ABIs.

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