rcu: Move redundant call to note_gp_changes() into called function

The __rcu_process_callbacks() invokes note_gp_changes() immediately
before invoking rcu_check_quiescent_state(), which conditionally
invokes that same function.  This commit therefore eliminates the
call to note_gp_changes() in __rcu_process_callbacks() in favor of
making unconditional to call from rcu_check_quiescent_state() to
note_gp_changes().

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

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 14fa9278b89d031b65163932069cf505412f4706..34db85570f71abb9cb74c7a15325d96bd638ca19 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1704,11 +1704,8 @@ rcu_report_qs_rdp(int cpu, struct rcu_state *rsp, struct rcu_data *rdp)
 static void
 rcu_check_quiescent_state(struct rcu_state *rsp, struct rcu_data *rdp)
 {
-       /* If there is now a new grace period, record and return. */
-       if (rdp->gpnum != rsp->gpnum) {
-               note_gp_changes(rsp, rdp);
-               return;
-       }
+       /* Check for grace-period ends and beginnings. */
+       note_gp_changes(rsp, rdp);
 
        /*
         * Does this CPU still need to do its part for current grace period?
@@ -2172,9 +2169,6 @@ __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.  */
-       note_gp_changes(rsp, rdp);
-
        /* Update RCU state based on any recent quiescent states. */
        rcu_check_quiescent_state(rsp, rdp);