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    SubjectRe: suspicious RCU usage warnings in 3.3.0
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    From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
    Date: Wed, 11 Apr 2012 17:45:07 -0700

    > If I am confused about the simple function call, and if control is really
    > passing via an interrupt or exception, then rcu_irq_enter() should be
    > called on entry to the interrupt or exception and rcu_irq_exit() should
    > be called on exit.

    Hmm, it seems the convention changed such that platforms aren't
    supposed to invoke do_softirq() from their trap return trap any more.
    It's handled completely by irq_exit().

    When did that start happening? :-)

    Anyways I bet that's the problem, sparc64 invokes do_softirq() in it's
    trap return path if softirqs are pending, and that doesn't do any
    of the RCU frobbing you mention.




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