tick_dep_clear_task
tick_dep_clear_task(current, TICK_DEP_BIT_RCU);
tick_dep_clear_task(current, TICK_DEP_BIT_RCU);
tick_dep_clear_task(current, TICK_DEP_BIT_RCU);
tick_dep_clear_task(tsk, TICK_DEP_BIT_POSIX_TIMER);