+/*
+ * Get the next state to run. Empty ones will be skipped. Returns true if a
+ * state must be run.
+ *
+ * st->state will be modified ahead of time, to match state_to_run, as if it
+ * has already ran.
+ */
+static bool cpuhp_next_state(bool bringup,
+ enum cpuhp_state *state_to_run,
+ struct cpuhp_cpu_state *st,
+ enum cpuhp_state target)
+{
+ do {
+ if (bringup) {
+ if (st->state >= target)
+ return false;
+
+ *state_to_run = ++st->state;
+ } else {
+ if (st->state <= target)
+ return false;
+
+ *state_to_run = st->state--;
+ }
+
+ if (!cpuhp_step_empty(bringup, cpuhp_get_step(*state_to_run)))
+ break;
+ } while (true);
+
+ return true;
+}
+
+static int cpuhp_invoke_callback_range(bool bringup,
+ unsigned int cpu,
+ struct cpuhp_cpu_state *st,
+ enum cpuhp_state target)