linux-kernel - Re: [PATCH 1/2] swiotlb: Make DIRECT_MAPPING

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Date:   Tue, 20 Nov 2018 17:07:42 +0100
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     hch@....de, konrad.wilk@...cle.com, m.szyprowski@...sung.com,
        john.stultz@...aro.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] swiotlb: Make DIRECT_MAPPING_ERROR viable

The subject line should say dma-direct.  This isn't really swiotlb
specific.

> +#define DIRECT_MAPPING_ERROR		~(dma_addr_t)0

Please add braces around the value like the other *MAPPING_ERROR
defintions so that it can be safely used in any context.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>