[Sound-open-firmware] [RFC PATCH v2 3/8] dma: ops: introduce num_channels_busy to get number of busy channels in DMAC

[Ranjani Sridharan]

On Fri, 2018-06-08 at 09:32 +0100, Liam Girdwood wrote:
> On Fri, 2018-06-08 at 00:51 -0700, Ranjani Sridharan wrote:
> > > >   
> > > > +               /* atomically increment num channels in use */
> > > > +               __sync_fetch_and_add(&dma->num_channels_busy,
> > > > 1);
> > > 
> > > Cant see where this is defined so this wont compile ? Please see
> > > arch/atomic.h
> > > for atomic arithmetic.
> > 
> > I have a question here: 
> > 
> > Can I cast a uint32_t * to atomic_t * and then pass it to the
> > atomic_add() function? Will it still be a atomic operation? 
> 
> Why do you need to do this ? atomic_t can be used like a uint32_t
> within your
> code already.

OK, thats what I thought too but just wanted to confirm. Thanks!
> 
> Liam 
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