# Re: Oops with PREEMPT-RT on 2.6.25.4

- From: Scott Wood \<hidden\>
- Date: 2008-05-19 21:49:18 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2008/05/1102152
- Thread: https://ratatoskr.run/linux-ide/2008/05/1102092/t.md

```text
Rune Torgersen wrote:
> Scott Wood wrote:
>> 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.
>
> The demuxer is setting itself up with set_irq_chained handler(), any
> pointers on how to change to irq_set_chip_and_handler()?

No, I mean the call to set_irq_chip() in pci_pic_host_map() where it sets up the IRQs it manages, not the cascade IRQ itself.

-Scott
```