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    SubjectRe: lockdep and threaded IRQs
    On Mon, 02 Mar 2009 14:46:47 -0800 (PST)
    David Miller <davem@davemloft.net> wrote:

    > From: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Date: Mon, 02 Mar 2009 23:19:31 +0100
    >
    > > I state that every !IRQF_DISABLED usage is a bug, either due to broken
    > > hardware or broken drivers.
    >
    > We'll send you the bill to have everyone's hardware
    > replaced :-)

    yes, but with what?

    No matter how fast all our interrupt handlers are, running them with
    local interrupts disabled has to worsen the worst-case interrupt
    latency.

    I don't see how removing !IRQF_DISABLED improves the kernel - in fact
    there's a latency argument for making !IRQF_DISABLED the default.


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