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    SubjectRe: [PATCH] prevent sparc64 from invoking irq handlers on offline CPUs
    From: Manfred Spraul <>
    Date: Tue, 09 Sep 2008 20:49:04 +0200

    > 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.

    It does work on sparc64. Such an IPI doesn't do a wait so there would
    be no deadlock issues either.

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      Last update: 2008-09-09 21:59    [W:0.021 / U:6.252 seconds]
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