kfree_call_rcu   1088 include/linux/rcupdate.h 		kfree_call_rcu(head, (void (*)(struct rcu_head *))(unsigned long)(offset)); \
kfree_call_rcu     53 include/linux/rcutree.h void kfree_call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu));