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    SubjectRe: [ANNOUNCE] 2.6.33-rc8-rt1
    On Mon, 22 Feb 2010, John Kacur wrote:
    > That patch fixes the symptom I reported, but unfortunately, I still
    > can't log-in to my laptop without the machine freezing.
    > Not sure why, investigating.

    Found it, at least it make my mouse/keyboard work again and fixes the
    weird double character problem on VT login.

    Thanks,

    tglx
    ----
    diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
    index 25642d1..1efad98 100644
    --- a/kernel/irq/manage.c
    +++ b/kernel/irq/manage.c
    @@ -563,15 +563,20 @@ irq_wait_for_interrupt(struct irq_desc *desc, struct irqaction *action)
    * handler finished. unmask if the interrupt has not been disabled and
    * is marked MASKED.
    */
    -static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc)
    +static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc,
    + struct irqaction *action)
    {
    chip_bus_lock(irq, desc);
    +#ifndef CONFIG_PREEMPT_RT
    raw_spin_lock_irq(&desc->lock);
    if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) {
    desc->status &= ~IRQ_MASKED;
    desc->chip->unmask(irq);
    }
    raw_spin_unlock_irq(&desc->lock);
    +#else
    + preempt_hardirq_thread_done(desc, action);
    +#endif
    chip_bus_sync_unlock(irq, desc);
    }

    @@ -645,7 +650,7 @@ static int irq_thread(void *data)
    action->thread_fn(action->irq, action->dev_id);

    if (oneshot)
    - irq_finalize_oneshot(action->irq, desc);
    + irq_finalize_oneshot(action->irq, desc, action);
    }

    wake = atomic_dec_and_test(&desc->threads_active);

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