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anything, and took up valuable KVA. While I'm in the area, clean up BSD
    MTRR stuff some more.
Suggested by: jonsmirl
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the CPU (David Mosberger, Benjamin Herrenschmidt, myself, Paul
    Mackerras, Jeff Wiedemeier)
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DRM_*MEMORYBARRIER we had were related to an MMIO space. This means
    arch-specific code on the BSDs, unfortunately. Also add
    DRM_MEMORYBARRIER() and change the DRM_READMEMORYBARRIER()s that used
    to be read/write barriers to it.
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1) Remove redundant header inclusion
2) Silence bitop on non-long argument warnings (change int to long)
3) Move to ISO C (gcc 2.6) initializers (accepted by older gccs also) All
    of these are syntax changes that should not impact functionality.
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