rcu: Enable diagnostic dump of rcu_node combining tree

The purpose of this commit is to make it easier to verify that RCU's
combining tree is set up correctly, which is useful to have when making
changes in how that tree is initialized.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
[ paulmck: Fold fix found by Fengguang's 0-day test robot. ]

1 files changed, 27 insertions, 0 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b49c474e1fff..1bc14c670641 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -113,6 +113,9 @@ RCU_STATE_INITIALIZER(rcu_bh, 'b', call_rcu_bh);
 static struct rcu_state *rcu_state_p;
 LIST_HEAD(rcu_struct_flavors);
 
+/* Dump rcu_node combining tree at boot to verify correct setup. */
+static bool dump_tree;
+module_param(dump_tree, bool, 0444);
 /* Control rcu_node-tree auto-balancing at boot time. */
 static bool rcu_fanout_exact;
 module_param(rcu_fanout_exact, bool, 0444);
@@ -4144,6 +4147,28 @@ static void __init rcu_init_geometry(void)
         rcu_num_nodes -= n;
 }
 
+/*
+ * Dump out the structure of the rcu_node combining tree associated
+ * with the rcu_state structure referenced by rsp.
+ */
+static void __init rcu_dump_rcu_node_tree(struct rcu_state *rsp)
+{
+        int level = 0;
+        struct rcu_node *rnp;
+
+        pr_info("rcu_node tree layout dump\n");
+        pr_info(" ");
+        rcu_for_each_node_breadth_first(rsp, rnp) {
+                if (rnp->level != level) {
+                        pr_cont("\n");
+                        pr_info(" ");
+                        level = rnp->level;
+                }
+                pr_cont("%d:%d ^%d  ", rnp->grplo, rnp->grphi, rnp->grpnum);
+        }
+        pr_cont("\n");
+}
+
 void __init rcu_init(void)
 {
         int cpu;
@@ -4154,6 +4179,8 @@ void __init rcu_init(void)
         rcu_init_geometry();
         rcu_init_one(&rcu_bh_state, &rcu_bh_data);
         rcu_init_one(&rcu_sched_state, &rcu_sched_data);
+        if (dump_tree)
+                rcu_dump_rcu_node_tree(&rcu_sched_state);
         __rcu_init_preempt();
         open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);