destroy_rcu_head_on_stack — destroy on-stack rcu_head for debugobjects
| void destroy_rcu_head_on_stack ( | struct rcu_head * head ); | 
   This function informs debugobjects that an on-stack rcu_head structure
   is about to go out of scope.  As with init_rcu_head_on_stack, this
   function is not required for rcu_head structures that are statically
   defined or that are dynamically allocated on the heap.  Also as with
   init_rcu_head_on_stack, this function has no effect for
   !CONFIG_DEBUG_OBJECTS_RCU_HEAD kernel builds.