Re: [PATCH] prevent sparc64 from invoking irq handlers on offlineCPUs

From: Manfred Spraul
Date: Tue Sep 09 2008 - 14:49:18 EST

David Miller wrote:
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.


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