Re: Oops with PREEMPT-RT on

From: Scott Wood
Date: Mon May 19 2008 - 17:38:20 EST

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.

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