static int nds32_pmu_add()

in kernel/perf_event_cpu.c [906:941]

• 24 lines of code
• 3 McCabe index (conditional complexity)

static int nds32_pmu_add(struct perf_event *event, int flags)
{
	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
	struct pmu_hw_events *hw_events = nds32_pmu->get_hw_events();
	struct hw_perf_event *hwc = &event->hw;
	int idx;
	int err = 0;

	perf_pmu_disable(event->pmu);

	/* If we don't have a space for the counter then finish early. */
	idx = nds32_pmu->get_event_idx(hw_events, event);
	if (idx < 0) {
		err = idx;
		goto out;
	}

	/*
	 * If there is an event in the counter we are going to use then make
	 * sure it is disabled.
	 */
	event->hw.idx = idx;
	nds32_pmu->disable(event);
	hw_events->events[idx] = event;

	hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
	if (flags & PERF_EF_START)
		nds32_start(event, PERF_EF_RELOAD);

	/* Propagate our changes to the userspace mapping. */
	perf_event_update_userpage(event);

out:
	perf_pmu_enable(event->pmu);
	return err;
}