9d9a6ebfea32 ("rcuwait: Let rcuwait_wake_up() return whether or not a task was awoken")
154abafc68bf ("tasks, sched/core: With a grace period after finish_task_switch(), remove unnecessary code")
3fbd7ee285b2 ("tasks: Add a count of task RCU users")
ec1d281923cf ("sched/core: Convert task_struct.usage to refcount_t")