genirq:fix concurrency issue in NMI counter

hulk inclusion
category: bugfix
bugzilla: 9298
CVE: NA

-------------------------------------------------

Incrementing the percpu kstat.irqs_sum is not safe in an NMI context as
we could have interrupted and interrupt trying to increment that same
counter.
Signed-off-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

kernel/irq/chip.c

@@ -748,7 +748,7 @@ void handle_fasteoi_nmi(struct irq_desc *desc)
 	unsigned int irq = irq_desc_get_irq(desc);
 	irqreturn_t res;
 
-	kstat_incr_irqs_this_cpu(desc);
+	this_cpu_inc(*desc->kstat_irqs);
 	trace_irq_handler_entry(irq, action);
 	/*
 	 * NMIs cannot be shared, there is only one action.
@@ -955,7 +955,7 @@ void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
 	unsigned int irq = irq_desc_get_irq(desc);
 	irqreturn_t res;
 
-	kstat_incr_irqs_this_cpu(desc);
+	this_cpu_inc(*desc->kstat_irqs);
 	trace_irq_handler_entry(irq, action);
 	res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
 	trace_irq_handler_exit(irq, action, res);