rcu_gp_in_progress

函数名称：Return true if an RCU grace period is in progress. The READ_ONCE()s* permit this function to be invoked without holding the root rcu_node* structure's ->lock, but of course results can be subject to change.

函数原型：static int rcu_gp_in_progress(void)

返回类型：int

参数：无

**调用者**
名称	描述
rcu_start_this_gp	_start_this_gp - Request the start of a particular grace period*@rnp_start: The leaf node of the CPU from which to start
rcu_gp_init	Initialize a new grace period. Return false if no grace period required.
rcu_report_qs_rsp	Report a full set of quiescent states to the rcu_state data structure
rcu_core	Perform RCU core processing work for the current CPU.
__call_rcu_core	Handle any core-RCU processing required by a call_rcu() invocation.
rcu_pending
rcu_stall_kick_kthreads	If too much time has passed in the current grace period, and if* so configured, go kick the relevant kthreads.
check_cpu_stall
rcu_check_gp_start_stall	This function checks for grace-period requests that fail to motivate* RCU to come out of its idle mode.
rcu_fwd_progress_check	Do a forward-progress check for rcutorture. This is normally invoked* due to an OOM event. The argument "j" gives the time period during* which rcutorture would like progress to have been made.

函数逻辑报告