This patch adds an ioctl to reassign the gem handle of a bo. It was formerly the first patch of my CRIU with dmabuf patchset.
Would it be possible to merge this on its own? Internal deadlines would prefer this to be in the next kernel release if possible. The CRIU patches that are the current use case for this can be found at https://github.com/checkpoint-restore/criu/pull/2613
