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It was always expected to have a use for this some day, so we left a placeholder. Now we do. (And I expect another use in the not too distant future when we start allowing userspace to allocate GPU iova.) Signed-off-by: Rob Clark <robdclark@chromium.org> Link: https://lore.kernel.org/r/20220304005317.776110-3-robdclark@gmail.com