provide more common DMA API functions V2

[Andrew Morton]

On Wed, 19 Aug 2015 10:08:14 +0200 Christoph Hellwig <hch at lst.de> wrote:

> On Tue, Aug 18, 2015 at 09:51:07AM +0200, Ingo Molnar wrote:
> > I.e. shouldn't this be:
> > 
> > > I'll merge these 5 patches for 4.4.  That means I'll release them into 
> > > linux-next after 4.2 is released.
> > >
> > > [...]
> > > 
> > > Linus will be releasing 4.2 in 1-2 weeks and until then, linux-next is supposed 
> > > to contain only 4.3 material.  Once 4.2 is released and the 4.3 merge window 
> > > opens, linux-next is open for 4.4 material.
> > 
> > ?
> 
> That would make a lot more sense.  But also be said as I intended
> these as the simple part of the dma work I'd like to get into 4.3.
> 
> Andrew, if you think it's not 4.3 material I'd rather keep them in
> my git tree for now so that I can stack additional patches I have
> in progress on top.  A non-git based tree like yours is unfortunately
> very bad for patches that are dependencies for others.

I think these will be OK for 4.3.  It's all quiet so far and any
problems will probably show up at compile time so they'll get fixed
promptly.