convert dc to using krefs for object reference counts

[Christian König]

Apart from a minor style nit pick which was repeated a few times the 
series is Reviewed-by: Christian König <christian.koenig at amd.com>.

Regards,
Christian.

Am 03.10.2017 um 04:38 schrieb Dave Airlie:
> This series might be a bit of a too big step :-)
>
> So in the kernel we use krefs for reference counts for lots of good
> reasons, the main one, is no bugs with roll your own atomic reference
> counting for structs, which lots of this code is.
>
> I've ported all the structs I could find using hand rolled atomic
> reference counters to use krefs.
>
> Dave.
>
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