Enabling interrupt filters by default

[Paolo Pisati]

Marcel Moolenaar wrote:
>
> August 2007.
AFAIK there were different menaces to turn it on
but i was never done.
>
> There was interrupt starvation on sparc64. 
there were problems with some bridges back then,
but i don't know the status today: you could try
and tell us :)

> There were also
> issues with permanently masking stray interrupts. This is
> problematic when interrupts are shared and there is at least
> 1 filter on it.
IIRC that was my mistake trying to cool down interrupt storms,
and that piece of code was removed.