debug_rcu_head

函数名称：debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally* by call_rcu() and rcu callback execution, and are therefore not part* of the RCU API. These are in rcupdate.h because they are used by all* RCU implementations.

函数原型：static inline int debug_rcu_head_queue(struct callback_head *head)

返回类型：int

参数：

类型	参数	名称
struct callback_head *	head

**调用者**
名称	描述
__call_srcu	Enqueue an SRCU callback on the srcu_data structure associated with* the current CPU and the specified srcu_struct structure, initiating* grace-period processing if it is not already running
srcu_barrier	srcu_barrier - Wait until all in-flight call_srcu() callbacks complete.*@ssp: srcu_struct on which to wait for in-flight callbacks.
__call_rcu	Helper function for call_rcu() and friends. The cpu argument will* normally be -1, indicating "currently running CPU". It may specify* a CPU only if that CPU is a no-CBs CPU. Currently, only rcu_barrier()* is expected to specify a CPU.
rcu_barrier_func	Called with preemption disabled, and from cross-cpu IRQ context.
call_rcu	Post an RCU callback to be invoked after the end of an RCU grace* period. But since we have but one CPU, that would be after any* quiescent state.

函数逻辑报告