nohz_cpu_mask question (was: Re: [PATCH tip/core/rcu] classic RCUlocking and memory-barrier cleanups)

[Manfred Spraul]

Hi all,

can someone explain me nohz_cpu_mask?

If I understand it correctly, it merely means that this cpu does not 
take timer interrupts, correct?
The cpu can still take "real" interupts, e.g. a nic interrupt. The cpu 
could also do softirq processing.

Is that correct? Ingo?

If nohz cpus can take normal interrupts, then it would be wrong to 
exclude these cpus from the mask of cpus that must pass a quiescent 
cycle - a softirq could hold on a pointers.

--
   Manfred
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