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Date: Fri, 15 Sep 2017 17:17:22 +0200
From: Christoph Hellwig <hch@lst.de>
To: Huacai Chen <chenhc@lemote.com>
Cc: Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Fuxin Zhang <zhangfx@lemote.com>, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org
Subject: Re: [PATCH V4 1/3] dma-mapping: Provide a default
        plat_device_is_coherent()
Message-ID: <20170915151722.GB2229@lst.de>
References: <1505444302-17036-1-git-send-email-chenhc@lemote.com>
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NAK.

For one plat_* is not a valid name for dma-mapping operations.

Second this needs a detailed explanation of the semantics and why
they matter.