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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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