Hi,

I would like to understand little bit about the FreeBSD interrupt handling on 
x86.

When a cpu is processing an IPI, let's say cpu is running IPI_STOP handler, are 
I/O interrupts like the timer interrupt disabled ? Conversely if the cpu is 
holding a spinlock, which means it has disabled interrupts, can it process an 
IPI. My understanding is executing "cli" instruction disables the maskable 
interrupts. I was wondering if IPIs are part of that.

Thanks,
Sushanth
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