Re: [RFC] dma: passing "attributes" to dma_map_* routines

[akepner]

On Fri, Dec 21, 2007 at 07:56:25AM +1100, Benjamin Herrenschmidt wrote:
> ...
> Can't you just have a primitive to sync things up that you call
> explicitely from your driver after fetching a new status entry ?
> 

Well, the only mechanisms I know to get things synced are the ones 
I mentioned before: 1) generate an interrupt, 2) write to memory 
which has the "barrier" attribute. Obviously 1 is out - giving  
the memory used for status indications the barrier attribute is 
the most primitive means I'm aware of.

-- 
Arthur

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