Re: [PATCH v5 13/17] perf: Support deferred user callchains

On Thu, 24 Apr 2025 18:38:45 +0200
Peter Zijlstra <[email protected]> wrote:

> > +	guard(irqsave)();
> > +
> > +        /* callback already pending? */
> > +        pending = READ_ONCE(event->pending_unwind_callback);
> > +        if (pending)
> > +                return 1;
> > +
> > +        /* Claim the work unless an NMI just now swooped in to do so. */
> > +        if (!try_cmpxchg(&event->pending_unwind_callback, &pending, 1))
> > +                return 1;
> > +
> > +        /* The work has been claimed, now schedule it. */
> > +        ret = task_work_add(current, work, TWA_RESUME);
> > +        if (WARN_ON_ONCE(ret)) {
> > +                WRITE_ONCE(event->pending_unwind_callback, 0);
> > +                return ret;
> > +        }
> > +	return 0;
> > +}  
> 
> You have whitespace issues ...

Bah, that may have been due to cut and paste to fix up things during the
multiple rebases I did.

Thanks!

-- Steve