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    SubjectRe: [RFC patch 5/5] genirq: make irq threading robust
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    On Wed, 2008-10-01 at 23:02 +0000, Thomas Gleixner wrote:

    > To make sure that a crashed irq thread does not cause more trouble
    > when the irq code tries to wake up a gone thread or the device code
    > calling free_irq and trying to kthread_stop the dead thread, we plug a
    > pointer to irqaction into task_struct, which is evaluated in
    > do_exit(). When the thread crashes the do_exit code marks the thread
    > as DIED in irqaction->flags to prevent further wakeups from the
    > interrupt handler code.

    > @@ -1301,6 +1301,7 @@ struct task_struct {
    > int latency_record_count;
    > struct latency_record latency_record[LT_SAVECOUNT];
    > #endif
    > + struct irqaction *irqaction;
    > };

    Is that going to fly? For the vast majority of task_structs this is now
    a wasted 4/8 bytes that won't be used.

    Jon.



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