[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 Thu, 2018-06-07 at 12:48 +0100, Liam Girdwood wrote:
> On Wed, 2018-06-06 at 16:09 -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? 
Thanks,
Ranjani


> 
> Liam