rcu_pending

Name:rcu_pending

Proto:static int rcu_pending(int user)

Type:int

Parameter:

Type	Parameter	Name
int	user

2824

rdp = this_cpu_ptr( & rcu_data)

2825

rnp = This CPU's leaf of hierarchy

2828

check_cpu_stall(rdp)

2831

If rcu_nocb_need_deferred_wakeup(rdp) Then Return 1

2835

If (user || _is_cpu_rrupt_from_idle - see if interrupted from idle* If the current CPU is idle and running at a first-level (not nested)* interrupt from idle, return true. The caller must have at least* disabled preemption.) && rcu_nohz_full_cpu() Then Return 0

2839

gp_in_progress = 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.

2840

If Core waits for quiesc state. && Not norm && gp_in_progress Then Return 1

2844

If Does the specified rcu_segcblist structure contain callbacks that* are ready to be invoked? Then Return 1

2848

If Not gp_in_progress && Is the specified rcu_segcblist enabled, for example, not corresponding* to an offline CPU? && ( Not IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_RCU_NOCB_CPU) || Not Is the specified rcu_segcblist offloaded? ) && Not Are all segments following the specified segment of the specified* rcu_segcblist structure empty of callbacks? (The specified* segment might well contain callbacks.) Then Return 1

2855

If Return the current value the update side's sequence number, no ordering. != Track rsp->rcu_gp_seq counter. || Value for the false possibility is greater at compile time(READ_ONCE(Possible ->gp_seq wrap. )) Then Return 1

2860

Return 0

**Caller**
Name	Describe
rcu_sched_clock_irq	This function is invoked from each scheduling-clock interrupt,* and checks to see if this CPU is in a non-context-switch quiescent* state, for example, user mode or idle loop. It also schedules RCU* core processing

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