Re: [PATCH v6 07/10] iommu/arm-smmu-v3: Implement pm_runtime & system sleep ops

[Pranjal Shrivastava <praan@google.com>]

On Mon, Apr 20, 2026 at 09:47:36PM -0700, Daniel Mentz wrote:
> On Tue, Apr 14, 2026 at 12:47 PM Pranjal Shrivastava <praan@google.com> wrote:
> > +       /* Mark the CMDQ to stop */
> > +       llq.val = READ_ONCE(cmdq->q.llq.val);
> > +       do {
> > +               head = llq;
> > +               head.prod |= CMDQ_PROD_STOP_FLAG;
> > +
> > +               old = cmpxchg_relaxed(&cmdq->q.llq.val, llq.val, head.val);
> > +               if (old == llq.val)
> > +                       break;
> > +
> > +               llq.val = old;
> > +       } while (1);
> 
> Can the equivalent be achieved with the following?
> 
> atomic_or(CMDQ_PROD_STOP_FLAG, &cmdq->q.llq.atomic.prod);

Ack, I'll update it to use atomic_fetch_or_relaxed() in the next version

Thanks,
Praan