>From: Marc Zyngier [mailto:marc.zyng...@arm.com] 
>Sent: Friday, December 18, 2015 6:31 PM

>> Note that I am working with ARC (seem alike) here and we do not define 
>> CONFIG_HANDLE_DOMAIN_IRQ and do not implement set_handle_irq().
>> 
>> So for ARC this reverse mapping is something we can leave without 
>> (maybe because we are kind of a legacy domain).

>Yeah, I just located the crap: arch_do_IRQ() happily takes a hwirq (the vector 
>number), and uses that as a Linux IRQ. This looks a lot like ARM pre-DT, about 
>10 years ago.

>Well, time to meet the 21st century. If you intend to use DT, please fix your 
>arch port. Otherwise, just hardcode everything in your platform and don't 
>pretend to support device tree.

Thank you very much. 
I have the complete picture now.

Will discuss with ARC maintainer and see what best way to do this change. 

-Noam

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