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

[Liam Girdwood]

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.

Liam