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    SubjectIntroduce fences for N:M completion variables [v2]
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    Peter Zijlstra gave a lot of feedback and thanks to him, I think both
    the function names and docs are a lot more sane. There is also a good
    consensus on renaming dma-buf's struct fence to be struct dma_fence,
    allowing for use of the cleaner name for the core struct.

    A quick overview of a fence is that it is a struct completion that waits
    on multiple events (rather than just one).
    -Chris

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