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SubjectRe: [PATCH v3 1/4] dma-buf: add support for virtio exported objects
  Hi,

> - for the runtime upcasting the usual approach is to check the ->ops
> pointer. Which means that would need to be the same for all virtio
> dma_bufs, which might get a bit awkward. But I'd really prefer we not
> add allocator specific stuff like this to dma-buf.

This is exactly the problem, it gets messy quickly, also when it comes
to using the drm_prime.c helpers ...

take care,
Gerd

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