From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH V2 07/19] csky: MMU and page table management
Date: Mon, 2 Jul 2018 06:29:15 -0700
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This commit is missing an explanation.

For the dma-mapping code please use the generic kernel/dma/noncoherent.c
code instead of duplicating it.