On Tue, 21 Jan 2025 18:30:52 -0800
Josh Poimboeuf [off-list ref] wrote:

The interface is similar to {task,irq}_work.  The caller owns an
unwind_work struct:

  struct unwind_work {
	struct callback_head		work;
	unwind_callback_t		func;
	int				pending;
  };

For perf, struct unwind_work is embedded in struct perf_event.  For
ftrace maybe it would live in task_struct?

Hmm, this is going to be difficult, as I don't want to add more to a task
struct as it's already too bloated as is. I'll have to think about this a bit.

-- Steve