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[PATCH tip/core/rcu 4/6] rcu: Make expedited RCU CPU stall warnings respond to controls

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The expedited RCU CPU stall warnings currently responds to neither the
panic_on_rcu_stall sysctl setting nor the rcupdate.rcu_cpu_stall_suppress
kernel boot parameter.  This commit therefore updates teh expedited code
to respond to these controls.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/rcu/tree_exp.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 3a647eb96f23..f316683b18f1 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -428,6 +428,9 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
 		if (ret > 0 || sync_rcu_preempt_exp_done(rnp_root))
 			return;
 		WARN_ON(ret < 0);  /* workqueues should not be signaled. */
+		if (rcu_cpu_stall_suppress)
+			continue;
+		panic_on_rcu_stall();
 		pr_err("INFO: %s detected expedited stalls on CPUs/tasks: {",
 		       rsp->name);
 		ndetected = 0;
-- 
2.5.2

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[PATCH tip/core/rcu 0/2] Expedited grace-period updates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 17:30 +0200
  [PATCH tip/core/rcu 3/6] rcu: Stop disabling expedited RCU CPU stall warnings "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 17:30 +0200
  [PATCH tip/core/rcu 4/6] rcu: Make expedited RCU CPU stall warnings respond to controls "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 17:30 +0200
  [PATCH tip/core/rcu 2/6] rcu: Drive expedited grace periods from workqueue "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 17:30 +0200
  [PATCH tip/core/rcu 6/6] rcu: Use RCU's online-CPU state for expedited IPI retry "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 17:30 +0200

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