274 static void watchdog_overflow_callback(struct perf_event *event,  in watchdog_overflow_callback()  argument
279 	event->hw.interrupts = 0;  in watchdog_overflow_callback()
522 	struct perf_event *event = per_cpu(watchdog_ev, cpu);  in watchdog_nmi_enable()  local
529 	if (event && event->state > PERF_EVENT_STATE_OFF)  in watchdog_nmi_enable()
533 	if (event != NULL)  in watchdog_nmi_enable()
540 	event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL);  in watchdog_nmi_enable()
543 	if (cpu == 0 && IS_ERR(event))  in watchdog_nmi_enable()
544 		cpu0_err = PTR_ERR(event);  in watchdog_nmi_enable()
546 	if (!IS_ERR(event)) {  in watchdog_nmi_enable()
566 	if (cpu > 0 && (PTR_ERR(event) == cpu0_err))  in watchdog_nmi_enable()
567 		return PTR_ERR(event);  in watchdog_nmi_enable()
570 	if (PTR_ERR(event) == -EOPNOTSUPP)  in watchdog_nmi_enable()
572 	else if (PTR_ERR(event) == -ENOENT)  in watchdog_nmi_enable()
577 			cpu, PTR_ERR(event));  in watchdog_nmi_enable()
581 	return PTR_ERR(event);  in watchdog_nmi_enable()
585 	per_cpu(watchdog_ev, cpu) = event;  in watchdog_nmi_enable()
594 	struct perf_event *event = per_cpu(watchdog_ev, cpu);  in watchdog_nmi_disable()  local
596 	if (event) {  in watchdog_nmi_disable()
597 		perf_event_disable(event);  in watchdog_nmi_disable()
601 		perf_event_release_kernel(event);  in watchdog_nmi_disable()