static void alpha_pmu_del()

in kernel/perf_event.c [485:521]

• 27 lines of code
• 4 McCabe index (conditional complexity)

static void alpha_pmu_del(struct perf_event *event, int flags)
{
	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
	struct hw_perf_event *hwc = &event->hw;
	unsigned long irq_flags;
	int j;

	perf_pmu_disable(event->pmu);
	local_irq_save(irq_flags);

	for (j = 0; j < cpuc->n_events; j++) {
		if (event == cpuc->event[j]) {
			int idx = cpuc->current_idx[j];

			/* Shift remaining entries down into the existing
			 * slot.
			 */
			while (++j < cpuc->n_events) {
				cpuc->event[j - 1] = cpuc->event[j];
				cpuc->evtype[j - 1] = cpuc->evtype[j];
				cpuc->current_idx[j - 1] =
					cpuc->current_idx[j];
			}

			/* Absorb the final count and turn off the event. */
			alpha_perf_event_update(event, hwc, idx, 0);
			perf_event_update_userpage(event);

			cpuc->idx_mask &= ~(1UL<<idx);
			cpuc->n_events--;
			break;
		}
	}

	local_irq_restore(irq_flags);
	perf_pmu_enable(event->pmu);
}