[RFC v2] dma-mapping: Use unsigned long for dma_attrs

On 05/31/2016 08:15 PM, Konrad Rzeszutek Wilk wrote:

On Mon, May 30, 2016 at 01:54:06PM +0200, Krzysztof Kozlowski wrote:

quoted

The dma-mapping core and the implementations do not change the
DMA attributes passed by pointer.  Thus the pointer can point to const
data.  However the attributes do not have to be a bitfield. Instead
unsigned long will do fine:

1. This is just simpler.  Both in terms of reading the code and setting
   attributes.  Instead of initializing local attributes on the stack and
   passing pointer to it to dma_set_attr(), just set the bits.

2. It brings safeness and checking for const correctness because the
   attributes are passed by value.

.. why not go the next step a do an enum? Perhaps that should be mentioned
as part of the description?

These are additive flags so to me this would look a little bit weird:
enum dma_attr {
	DMA_ATTR_WRITE_BARRIER	= 0x1,
	DMA_ATTR_WEAK_ORDERING	= 0x2,
	DMA_ATTR_WRITE_COMBINE	= 0x4,
	DMA_ATTR_NON_CONSISTENT	= 0x8,
	...
}

It doesn't really look like enumeration.

Best regards,
Krzysztof