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Date: Wed, 2 May 2018 23:20:18 +0100
From: James Hogan <jhogan@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 11/13] mips, unicore32: swiotlb doesn't need sg->dma_length
Message-ID: <20180502222017.GC20766@jamesdev>
References: <20180425051539.1989-1-hch@lst.de>
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Cc: linux-mips@linux-mips.org, sstabellini@kernel.org,
 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, linux-pci@vger.kernel.org,
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On Wed, Apr 25, 2018 at 07:15:37AM +0200, Christoph Hellwig wrote:
> Only mips and unicore32 select CONFIG_NEED_SG_DMA_LENGTH when building
> swiotlb.  swiotlb itself never merges segements and doesn't accesses the
> dma_length field directly, so drop the dependency.

Is that at odds with Documentation/DMA-API-HOWTO.txt, which seems to
suggest arch ports should enable it for IOMMUs?

Cheers
James

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