linux-kernel - Re: [PATCH v2] dma-mapping: benchmark: pretend DMA is transmitting

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Message-ID: <20210205092113.GA870@lst.de>
Date:   Fri, 5 Feb 2021 10:21:13 +0100
From:   Christoph Hellwig <hch@....de>
To:     Barry Song <song.bao.hua@...ilicon.com>
Cc:     m.szyprowski@...sung.com, hch@....de, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linuxarm@...neuler.org
Subject: Re: [PATCH v2] dma-mapping: benchmark: pretend DMA is transmitting

On Fri, Feb 05, 2021 at 03:00:35PM +1300, Barry Song wrote:
> +	__u32 dma_trans_ns; /* time for DMA transmission in ns */
>  	__u64 expansion[10];	/* For future use */

We need to keep the struct size, so the expansion field needs to
shrink by the equivalent amount of data that is added in dma_trans_ns.