[PATCH v4 3/7] [RFC] arm/arm64: introduce is_dma_coherent

[Stefano Stabellini]

On Sat, 25 Oct 2014, Ian Campbell wrote:
> On Sat, 2014-10-25 at 14:29 +0100, Stefano Stabellini wrote:
> >  
> > Your suggestions and looking more at the code gave me another idea, that
> > I think is clean and at the same time suitable for 3.18.
> > What do you think of the following? It is simple, self-contained and
> > doesn't need a new flag in struct device.
> 
> of_dma_is_coherent looks to be quite expensive though (walks up the
> Device Tree doing strcmps on each property of each node until it finds
> the one it is looking for.

It takes spin_locks too!
Too bad, I think I'll have to ditch it. In that case I'l try the new
flag in struct device approach.