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rcu: Add diagnostics to grace-period cleanup
At grace-period initialization time, RCU checks that all quiescent states were really reported for the previous grace period. Now that grace-period cleanup has been split out of grace-period initialization, this commit also performs those checks at grace-period cleanup time. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -1920,6 +1920,8 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
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rcu_for_each_node_breadth_first(rsp, rnp) {
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raw_spin_lock_irq(&rnp->lock);
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smp_mb__after_unlock_lock();
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WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp));
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WARN_ON_ONCE(rnp->qsmask);
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ACCESS_ONCE(rnp->completed) = rsp->gpnum;
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rdp = this_cpu_ptr(rsp->rda);
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if (rnp == rdp->mynode)
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