shotgun.diff

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 65a73cd62a7d..54a3e43cea29 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -319,6 +319,8 @@ void rcu_note_context_switch(bool preempt)
 	static int nr_cs;
 	int i;
 
+	trace_printk("We are here: (%s) (%d)\n", __FILE__, __LINE__);
+
 	// Every 1000 context switches, spin for 5ms
 	// Only do this if we are 5 seconds past boot.
 	if (enable_cs_bug && nr_cs++ % 1000 == 0 && ktime_get_boottime_ns() > 5000000000UL) {
@@ -328,12 +330,20 @@ void rcu_note_context_switch(bool preempt)
 			cpu_relax();
 		}
 	}
+	trace_printk("We are here: (%s) (%d)\n", __FILE__, __LINE__);
+
 
 	trace_rcu_utilization(TPS("Start context switch"));
+	trace_printk("We are here: (%s) (%d)\n", __FILE__, __LINE__);
+
 	lockdep_assert_irqs_disabled();
 	WARN_ONCE(!preempt && rcu_preempt_depth() > 0, "Voluntary context switch within RCU read-side critical section!");
+	trace_printk("We are here: (%s) (%d)\n", __FILE__, __LINE__);
+
 	if (rcu_preempt_depth() > 0 &&
 	    !t->rcu_read_unlock_special.b.blocked) {
+	trace_printk("We are here: (%s) (%d)\n", __FILE__, __LINE__);
+
 
 		/* Possibly blocking in an RCU read-side critical section. */
 		rnp = rdp->mynode;