drm - Stabilize broadwell and improve skylake

* The issue was primarily the bitops on longs were all wrong. '1 << N'
returns an integer (even if N is a long), so those had to be 1L or 1LU.
Ther

drm - Stabilize broadwell and improve skylake

* The issue was primarily the bitops on longs were all wrong. '1 << N'
returns an integer (even if N is a long), so those had to be 1L or 1LU.
There were also some missing parenthesis in the bit test code.

* Throw in one fix from Linux, but I think its basically a NOP when DMAPs
are used (and we use DMAPs).

* Add some code to catch a particular failure condition by locking up X
in a while/tsleep loop instead of crashing outright, allowing a remote
login to kgdb the live system.

show more ...

drm/include: Add missing parentheses in a macro.

kernel/linux: Add hweight8()