rcu: Remove fastpath from __rcu_process_callbacks()

The standard code path accommodates a condition when no
RCU callbacks are ready to invoke. Since size of the code
is a priority for tiny RCU, remove the fast path.

Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index d4e7fe5..069742d 100644 (file)
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -168,17 +168,6 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
        unsigned long flags;
        RCU_TRACE(int cb_count = 0);
 
-       /* If no RCU callbacks ready to invoke, just return. */
-       if (&rcp->rcucblist == rcp->donetail) {
-               RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, 0, -1));
-               RCU_TRACE(trace_rcu_batch_end(rcp->name, 0,
-                                             !!ACCESS_ONCE(rcp->rcucblist),
-                                             need_resched(),
-                                             is_idle_task(current),
-                                             false));
-               return;
-       }
-
        /* Move the ready-to-invoke callbacks to a local list. */
        local_irq_save(flags);
        RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, rcp->qlen, -1));