David Miller wrote:
quoted text
> And IPI handler runs in HW irq context, therefore such an IPI-creates-an-IPI
> should not be allowed, at least not directly.
>
> Actually the restriction seems to be that an IPI cannot be sent when
> "irqs_disabled()", hmmm...
>
>   
Does this apply to smp_send_reschedule() as well?
A [rare] codepath in the current rcu code does to trigger quiescent 
states on remote cpus.

--
    Manfred

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