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

Christoph Hellwig hch at infradead.org
Sat Jan 19 10:25:27 UTC 2019


On Fri, Jan 18, 2019 at 10:37:46AM -0800, Liam Mark wrote:
> Add support for configuring dma mapping attributes when mapping
> and unmapping memory through dma_buf_map_attachment and
> dma_buf_unmap_attachment.
> 
> Signed-off-by: Liam Mark <lmark at codeaurora.org>

And who is going to decide which ones to pass?  And who documents
which ones are safe?

I'd much rather have explicit, well documented dma-buf flags that
might get translated to the DMA API flags, which are not error checked,
not very well documented and way to easy to get wrong.


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