rcu: Eliminate second argument of rcu_process_dyntick()

At this point, the second argument to all calls to
rcu_process_dyntick() is a function of the same field of the
structure passed in as the first argument, namely, rsp->gpnum-1.
 So propagate rsp->gpnum-1 to all uses of the second argument
within rcu_process_dyntick() and then eliminate the second
argument.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <12626465503786-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 62b64332effb798ea0bae9d7d7d807602fcaf866..c7d00700fc4e6c62638412b78749e37656a6af13 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1147,7 +1147,7 @@ void rcu_check_callbacks(int cpu, int user)
  * Returns 1 if the current grace period ends while scanning (possibly
  * because we made it end).
  */
-static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
+static int rcu_process_dyntick(struct rcu_state *rsp,
                               int (*f)(struct rcu_data *))
 {
        unsigned long bit;
@@ -1159,7 +1159,7 @@ static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
        rcu_for_each_leaf_node(rsp, rnp) {
                mask = 0;
                spin_lock_irqsave(&rnp->lock, flags);
-               if (rnp->completed != lastcomp) {
+               if (rnp->completed != rsp->gpnum - 1) {
                        spin_unlock_irqrestore(&rnp->lock, flags);
                        return 1;
                }
@@ -1173,7 +1173,7 @@ static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
                        if ((rnp->qsmask & bit) != 0 && f(rsp->rda[cpu]))
                                mask |= bit;
                }
-               if (mask != 0 && rnp->completed == lastcomp) {
+               if (mask != 0 && rnp->completed == rsp->gpnum - 1) {
 
                        /* rcu_report_qs_rnp() releases rnp->lock. */
                        rcu_report_qs_rnp(mask, rsp, rnp, flags);
@@ -1226,7 +1226,7 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
                        break; /* So gcc recognizes the dead code. */
 
                /* Record dyntick-idle state. */
-               gpdone = rcu_process_dyntick(rsp, rsp->gpnum - 1,
+               gpdone = rcu_process_dyntick(rsp,
                                             dyntick_save_progress_counter);
                spin_lock(&rnp->lock);  /* irqs already disabled */
                if (gpdone)
@@ -1249,8 +1249,7 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 
                /* Check dyntick-idle state, send IPI to laggarts. */
                spin_unlock(&rnp->lock);  /* irqs remain disabled */
-               gpdone = rcu_process_dyntick(rsp, rsp->gpnum - 1,
-                                            rcu_implicit_dynticks_qs);
+               gpdone = rcu_process_dyntick(rsp, rcu_implicit_dynticks_qs);
 
                /* Leave state in case more forcing is required. */