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rcu: Allow processing deferred QSes for exiting RCU-preempt readers
If an RCU-preempt read-side critical section is exiting, that is, ->rcu_read_lock_nesting is negative, then it is a good time to look at the possibility of reporting deferred quiescent states. This commit therefore updates the checks in rcu_preempt_need_deferred_qs() to allow exiting critical sections to report deferred quiescent states. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -602,7 +602,7 @@ static bool rcu_preempt_need_deferred_qs(struct task_struct *t)
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{
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{
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return (this_cpu_ptr(&rcu_preempt_data)->deferred_qs ||
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return (this_cpu_ptr(&rcu_preempt_data)->deferred_qs ||
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READ_ONCE(t->rcu_read_unlock_special.s)) &&
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READ_ONCE(t->rcu_read_unlock_special.s)) &&
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!t->rcu_read_lock_nesting;
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t->rcu_read_lock_nesting <= 0;
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}
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}
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/*
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/*
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