rcu: Remove obsolete callback-invocation statistics for debugfs

The debugfs interface displayed statistics on RCU callback invocation but
this interface has since been removed.  This commit therefore removes the
no-longer-used rcu_data structure's ->n_cbs_invoked and ->n_nocbs_invoked
fields along with their updates.

If this information proves necessary in the future, the corresponding
event traces will be added.

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

1 files changed, 0 insertions, 1 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 66c73a214cff..8e0711954bbf 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2691,7 +2691,6 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
         /* Update counts and requeue any remaining callbacks. */
         rcu_segcblist_insert_done_cbs(&rdp->cblist, &rcl);
         smp_mb(); /* List handling before counting for rcu_barrier(). */
-        rdp->n_cbs_invoked += count;
         rcu_segcblist_insert_count(&rdp->cblist, &rcl);
 
         /* Reinstate batch limit if we have worked down the excess. */