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

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Message-ID: <556f4076-08f5-471f-872b-a2384dcad494@huawei.com>
Date: Wed, 7 May 2025 17:09:25 +0800
From: Qinxin Xia <xiaqinxin@...wei.com>
To: Barry Song <21cnbao@...il.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: Re: [PATCH v2 1/4] dma-mapping: benchmark: Add padding to ensure uABI
 remained consistent


在 2025/5/7 9:52, Barry Song 写道:
> On Tue, May 6, 2025 at 3:01 PM Qinxin Xia <xiaqinxin@...wei.com> wrote:
>> 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>
> Please add Fixes tags and cc stable.

Okay, I'll fix it in the next version.

Thanks!

>> ---
>>   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
>>
> Thanks
> Barry