rcu: Switch callers from rcu_process_gp_end() to note_gp_changes()

Because note_gp_changes() now incorporates rcu_process_gp_end() function,
this commit switches to the former and eliminates the latter.  In
addition, this commit changes external calls from __rcu_process_gp_end()
to __note_gp_changes().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 3 insertions, 28 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 7eb2bc95300a..b04f134ab8bc 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1344,28 +1344,6 @@ static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp)
 }
 
 /*
- * Advance this CPU's callbacks, but only if the current grace period
- * has ended.  This may be called only from the CPU to whom the rdp
- * belongs.
- */
-static void
-rcu_process_gp_end(struct rcu_state *rsp, struct rcu_data *rdp)
-{
-        unsigned long flags;
-        struct rcu_node *rnp;
-
-        local_irq_save(flags);
-        rnp = rdp->mynode;
-        if (rdp->completed == ACCESS_ONCE(rnp->completed) || /* outside lock. */
-            !raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */
-                local_irq_restore(flags);
-                return;
-        }
-        __rcu_process_gp_end(rsp, rnp, rdp);
-        raw_spin_unlock_irqrestore(&rnp->lock, flags);
-}
-
-/*
  * Did someone else start a new RCU grace period start since we last
  * checked?  Update local state appropriately if so.  Must be called
  * on the CPU corresponding to rdp.
@@ -1393,9 +1371,6 @@ check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
 static void
 rcu_start_gp_per_cpu(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp)
 {
-        /* Prior grace period ended, so advance callbacks for current CPU. */
-        __rcu_process_gp_end(rsp, rnp, rdp);
-
         /* Set state so that this CPU will detect the next quiescent state. */
         __note_gp_changes(rsp, rnp, rdp);
 }
@@ -1531,7 +1506,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
                 ACCESS_ONCE(rnp->completed) = rsp->gpnum;
                 rdp = this_cpu_ptr(rsp->rda);
                 if (rnp == rdp->mynode)
-                        __rcu_process_gp_end(rsp, rnp, rdp);
+                        __note_gp_changes(rsp, rnp, rdp);
                 nocb += rcu_future_gp_cleanup(rsp, rnp);
                 raw_spin_unlock_irq(&rnp->lock);
                 cond_resched();
@@ -2276,7 +2251,7 @@ __rcu_process_callbacks(struct rcu_state *rsp)
         WARN_ON_ONCE(rdp->beenonline == 0);
 
         /* Handle the end of a grace period that some other CPU ended.  */
-        rcu_process_gp_end(rsp, rdp);
+        note_gp_changes(rsp, rdp);
 
         /* Update RCU state based on any recent quiescent states. */
         rcu_check_quiescent_state(rsp, rdp);
@@ -2362,7 +2337,7 @@ static void __call_rcu_core(struct rcu_state *rsp, struct rcu_data *rdp,
         if (unlikely(rdp->qlen > rdp->qlen_last_fqs_check + qhimark)) {
 
                 /* Are we ignoring a completed grace period? */
-                rcu_process_gp_end(rsp, rdp);
+                note_gp_changes(rsp, rdp);
                 check_for_new_grace_period(rsp, rdp);
 
                 /* Start a new grace period if one not already started. */