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

[Liam Mark]

On Mon, 21 Jan 2019, Christoph Hellwig wrote:

> 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.
> 

With the previous version of ION Android ION clients were successfully 
managing all their cache maintenance.



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