[$] The reverting of revocable

Transient devices pose a special challenge for an operating-system kernel.They can disappear at any time, leaving behind kernel data structures thatno longer refer to an existing device, but which may still be in use byunknown kernel code. Managing the resulting lifecycle issues hasfrustrated kernel developers for years. In September 2025, the revocable resource-management patch seriesfrom Tzung-Bi Shih appeared to offer a partial solution to this problem.Since then, though, other problems have arisen, and the planned merging ofthis series into the 7.0 release has been called off.