[Xen-devel] [question] what's the purpose of smp_send_event_check_mask?

[Kai Huang <mail.kai.huang@xxxxxxxxx>]

Hi,

I see cpu_raise_softirq calls smp_send_event_check_mask after setting
softirq bit for target CPU if target CPU is not the current CPU. I
thought smp_send_event_check_mask will send IPI to target CPU and then
trigger target CPU to run pending irq, but seems
smp_send_event_check_mask does nothing but jast ACK the IPI. So what's
the purpose of this function? Why do we need this function?

BTW, would someone gives me some knowledge when will the pending irqs
be triggered to run after setting up the pending bits? Seems normally
they are called asynchronously.

Thanks in advance!

-cody

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