Current irq_stat.timers_irqs counting doesn't discriminate timer event handler
and other timer interrupt(like arch_irq_work_raise). Sometimes we need to know
exactly how much interrupts timer event handler fired, so let's be more specific
on this.
Signed-off-by: NFan Du <fan.du@windriver.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>