Quoting Tvrtko Ursulin (2018-09-06 10:50:32)
> 
> On 05/09/2018 16:29, Chris Wilson wrote:
> > I've a slight preference to setting to 0 then overwriting it afterwards.
> 
> We can't use/validate it then. Alternative to just not clear it for ABI 
> where it is not used? In other words would go away from the case 
> branches completely. Does the ABI depend on it being zeroed on return 
> from get_param? It would be strange..

Bah, I was just looking at the patch hoping for the best (without
thinking). I've some recollection of doing something similar and coming
to the same conclusion.
-Chris
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