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From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
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Subject: Re: [PATCH] dma-mapping: Don't store redundant offsets
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On Fri, Nov 24, 2023 at 06:10:03PM +0000, Robin Murphy wrote:
> A bus_dma_region necessarily stores both CPU and DMA base addresses for
> a range, so there's no need to also store the difference between them.

Yes.  I'll add this to the for-next branch for 6.8 once I open it.