Looks like we also want these commits to fully support backporting this to trusty and pick up all the spinlock fixes in one go:
919fc6e34831d1c2b58bfb5ae261dc3facc9b269 3405d230b374b6923878b21b8d708d7db1f734ef 7179ba52889bef7e5e23f72908270e1ab2b7fc6f
Looks like we also want these commits to fully support backporting this to trusty and pick up all the spinlock fixes in one go:
919fc6e34831d1c 2b58bfb5ae261dc 3facc9b269 23878b21b8d708d 7db1f734ef e5e23f72908270e 1ab2b7fc6f
3405d230b374b69
7179ba52889bef7