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Date:   Mon, 1 Oct 2018 01:08:18 +0200
From:   christoph hellwig <hch@lst.de>
To:     Guan Xuetao <gxt@pku.edu.cn>
Cc:     christoph hellwig <hch@lst.de>, iommu@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH, RFC] unicore32: remove swiotlb support
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On Sat, Sep 29, 2018 at 09:40:27PM +0800, Guan Xuetao wrote:
> That's right and really good to use direct.c, not swiotlb.c
> No special limitation for dma zone in unicore32.

Thanks.  Added to the dma-mapping tree for 4.20.