interrupt framework

[Warner Losh]

> On Jan 16, 2015, at 5:03 AM, Andrew Turner <andrew at fubar.geek.nz> wrote:
> 
> On Fri, 16 Jan 2015 12:44:22 +0100
> Svatopluk Kraus <onwahe at gmail.com> wrote:
> ...
>> It's just a few things from quick look now which are different in our
>> design. However, my intention is not read our code on behalf of you. I
>> still think that our design is more general mainly and can serve for
>> interrupt controllers better.
> 
> I was asking on the differences as I'm already in the process of
> importing the arm_intrng project branch as I need something like it on
> arm64. It is also based on the same code from Jakub and Ian, I haven't
> looked at changing the design, just cleaning up the code to import into
> head.
> 
> I would be happy to merge your code instead, along with my existing
> cleanups, however I would need to know why I should spend time on it as
> opposed to the current development branch. If we do decide to with your
> change I would like to import it into the arm_intrng project branch
> first to assist the import into head.

My first look at Svatopluk’s code and summaries, on its surface it seems
to be a simpler, more generalized and more effective design than intern.
It avoids some additional overhead that’s always troubled me about intern
that I’ve not had the time to make good suggestions to overcome. It looks
(again on its surface) easier to bring to all the architectures as well.

I haven’t tried to use the code so I can’t comment on its stability. So of course
I can’t measure the differences in interrupt latencies between the two. Both of
these factors would be the kind of data that would help drive the decision of which
one to adapt.

Warner
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