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    SubjectRe: Oops with PREEMPT-RT on 2.6.25.4
    Rune Torgersen wrote:
    > Scott Wood wrote:
    >> Almost certainly the latter. Is the disk interrupt shared with any
    >> other interrupts, that are marked IRQF_NODELAY? The -rt
    >> patch doesn't seem to handle mixing the two well.
    >
    > Disk is on a muxed PCI interrupt. None of the other interrupts on the
    > mux is fireing at the time.

    Regardless of whether they're firing, any request_irq with IRQF_NODELAY
    will turn off threading for all handlers.

    > Is is possible that the demuxer is not set up right? It is based loosely
    > on pq2-pci-pic.c

    Try calling irq_set_chip_and_handler() with handle_level_irq, rather
    than irq_set_chip(). The -rt patch doesn't seem to have threadified the
    __do_IRQ() path.

    -Scott


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