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

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