linux-kernel - Re: [PATCH V4 1/3] dma-mapping: Provide a default plat_device_is

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

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.