linux-kernel - Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping attributes

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Message-ID: <20190121213028.GB28620@infradead.org>
Date:   Mon, 21 Jan 2019 13:30:28 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Liam Mark <lmark@...eaurora.org>
Cc:     "Andrew F. Davis" <afd@...com>,
        Christoph Hellwig <hch@...radead.org>,
        Laura Abbott <labbott@...hat.com>, sumit.semwal@...aro.org,
        arve@...roid.com, tkjos@...roid.com, maco@...roid.com,
        joel@...lfernandes.org, christian@...uner.io,
        devel@...verdev.osuosl.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        john.stultz@...aro.org
Subject: Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping
 attributes

On Mon, Jan 21, 2019 at 12:20:42PM -0800, Liam Mark wrote:
> I have left this to clients, but if they own the buffer they can have the 
> knowledge as to whether CPU access is needed in that use case (example for 
> post-processing).

That is an API design which the user is more likely to get wrong than
right and thus does not pass the smell test.