provide more common DMA API functions V2

[Michael Ellerman]

On Thu, 2015-08-20 at 09:52 +1000, Stephen Rothwell wrote:
> Hi Andrew (sorry, I can't tell who made the incorrect statement below
> that I am replying to),
> 
> On Wed, 19 Aug 2015 14:36:56 -0700 Andrew Morton <akpm at linux-foundation.org> wrote:
> >
> > 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.
> 
> Just to be clear: the above should read "Once 4.2 is released and the
> 4.3 merge window *closes* (i.e. v4.3-rc1 is released), linux-next is
> open for 4.4 material".

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cheers