rcu: Don't scan root rcu_node structure for stalled tasks

Now that blocked tasks are no longer migrated to the root rcu_node
structure, there is no need to scan the root rcu_node structure for
blocked tasks stalling the current grace period.  This commit therefore
removes this scan.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 0 insertions, 9 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 24d3c67f7be7..4ed2c2842103 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1107,15 +1107,6 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
                 raw_spin_unlock_irqrestore(&rnp->lock, flags);
         }
 
-        /*
-         * Now rat on any tasks that got kicked up to the root rcu_node
-         * due to CPU offlining.
-         */
-        rnp = rcu_get_root(rsp);
-        raw_spin_lock_irqsave(&rnp->lock, flags);
-        ndetected += rcu_print_task_stall(rnp);
-        raw_spin_unlock_irqrestore(&rnp->lock, flags);
-
         print_cpu_stall_info_end();
         for_each_possible_cpu(cpu)
                 totqlen += per_cpu_ptr(rsp->rda, cpu)->qlen;