for (i = 0; i < NR_CPUS; i++) if (cpu_possible(i)) sum += kstat_cpu(i).irqs[irq];
for_each_cpu(cpu) sum += kstat_cpu(cpu).irqs[irq];
static inline int kstat_irqs(int irq){	int i, sum=0;	for (i = 0; i < NR_CPUS; i++)		if (cpu_possible(i))			sum += kstat_cpu(i).irqs[irq];	return sum;}