linux-kernel - Re: [PATCH v4] tools/dma: move dma_map_benchmark from selftests to tools/dma

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Message-ID: <CAGsJ_4wMtWZUTWRePK9_90LrbANUo7RcVkBRbQJ4aBEypWwtLQ@mail.gmail.com>
Date: Wed, 22 Oct 2025 17:23:04 +1300
From: Barry Song <21cnbao@...il.com>
To: Qinxin Xia <xiaqinxin@...wei.com>
Cc: m.szyprowski@...sung.com, robin.murphy@....com, prime.zeng@...wei.com, 
	fanghao11@...wei.com, linux-kernel@...r.kernel.org, linuxarm@...wei.com, 
	wangzhou1@...ilicon.com
Subject: Re: [PATCH v4] tools/dma: move dma_map_benchmark from selftests to tools/dma

>
>  #define DMA_MAP_BENCHMARK       _IOWR('d', 1, struct map_benchmark)
>  #define DMA_MAP_MAX_THREADS     1024
> @@ -27,5 +29,7 @@ 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 */
>  };

I didn’t realize you were hiding a bugfix within the code cleanup.

We agreed this is a hotfix that should be merged promptly[1]. Before sending
v5, please submit the hotfix first using the existing folder (without moving
the code from selftest to tools). Once it is merged, resend v5 based on it.

[1] https://lore.kernel.org/lkml/f8c0cbdc-9c68-46bb-8dad-1d7c80f3f741@samsung.com/

Thanks
Barry