Re: [RFC] Deadlock via recursive wakeup via RCU with threadirqs

Sebastian Andrzej Siewior
2019-07-01T10:24:52Z

On 2019-07-01 11:42:15 [+0200], Peter Zijlstra wrote:
> I'm not sure if smp_send_reschedule() can be used as self-IPI, some
> hardware doesn't particularly like that IIRC. That is, hardware might
> only have interfaces to IPI _other_ CPUs, but not self.
>
> The normal scheduler code takes care to not call smp_send_reschedule()
> to self.

and irq_work:
471ba0e686cb1 ("irq_work: Do not raise an IPI when queueing work on the local CPU")

Sebastian