[PATCHv3 net-next 21/22] net: mvpp2: set dma mask and coherent dma mask on PPv2.2

[David Laight]

From: Thomas Petazzoni
> Sent: 07 March 2017 18:12
> Hello,
> 
> On Tue, 7 Mar 2017 17:24:21 +0000, David Laight wrote:
> 
> > Are the coherent mappings just used for ring structures?
> > If it might be reasonable to allocate them as a single entity,
> > thus guaranteeing they all reside in a single 4G region.
> 
> Do we have the guarantee that a DMA coherent allocation will not span a
> 4G boundary?

I'm pretty sure they are guaranteed not to cross any boundary they don't have to.
So a 16k buffer won't cross a 16k boundary.

	David