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

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Message-ID: <CAGsJ_4zBz0oZGpP3dTzsjmw0oJbWm=vkKRS_kjBso7cvKJGjuQ@mail.gmail.com>
Date: Wed, 7 May 2025 13:52:04 +1200
From: Barry Song <21cnbao@...il.com>
To: Qinxin Xia <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: Re: [PATCH v2 1/4] dma-mapping: benchmark: Add padding to ensure uABI
 remained consistent

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.

> ---
>  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