Maybe it can be introduced gradually, making the reallocation an optional feature that a driver might support. Then drivers can independently implement the reso

Maybe it can be introduced gradually, making the reallocation an optional feature that a driver might support. Then drivers can independently implement the resource reallocation feature. Mainline drivers can move gradually. If they want to be nice for out-of-tree drivers then they can describe a timeline for deprecating and removing the support for non-reallocating drivers.