rcu: Remove rsp parameter from print_cpu_stall_info()

There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions.  This commit therefore removes the rsp parameter from
print_cpu_stall_info().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

kernel/rcu/tree.c

@@ -1342,7 +1342,7 @@ static void print_other_cpu_stall(unsigned long gp_seq)
 		if (rnp->qsmask != 0) {
 			for_each_leaf_node_possible_cpu(rnp, cpu)
 				if (rnp->qsmask & leaf_node_cpu_bit(rnp, cpu)) {
-					print_cpu_stall_info(rsp, cpu);
+					print_cpu_stall_info(cpu);
 					ndetected++;
 				}
 		}
@@ -1409,7 +1409,7 @@ static void print_cpu_stall(void)
 	pr_err("INFO: %s self-detected stall on CPU", rsp->name);
 	print_cpu_stall_info_begin();
 	raw_spin_lock_irqsave_rcu_node(rdp->mynode, flags);
-	print_cpu_stall_info(rsp, smp_processor_id());
+	print_cpu_stall_info(smp_processor_id());
 	raw_spin_unlock_irqrestore_rcu_node(rdp->mynode, flags);
 	print_cpu_stall_info_end();
 	for_each_possible_cpu(cpu)

kernel/rcu/tree.h

@@ -472,7 +472,7 @@ static bool rcu_preempt_has_tasks(struct rcu_node *rnp);
 static bool rcu_preempt_need_deferred_qs(struct task_struct *t);
 static void rcu_preempt_deferred_qs(struct task_struct *t);
 static void print_cpu_stall_info_begin(void);
-static void print_cpu_stall_info(struct rcu_state *rsp, int cpu);
+static void print_cpu_stall_info(int cpu);
 static void print_cpu_stall_info_end(void);
 static void zero_cpu_stall_ticks(struct rcu_data *rdp);
 static void increment_cpu_stall_ticks(void);

kernel/rcu/tree_plugin.h

@@ -1771,7 +1771,7 @@ static void print_cpu_stall_info_begin(void)
  *
  * Also print out idle and (if CONFIG_RCU_FAST_NO_HZ) idle-entry info.
  */
-static void print_cpu_stall_info(struct rcu_state *rsp, int cpu)
+static void print_cpu_stall_info(int cpu)
 {
 	unsigned long delta;
 	char fast_no_hz[72];
@@ -1786,7 +1786,7 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu)
 	 */
 	touch_nmi_watchdog();
 
-	ticks_value = rcu_seq_ctr(rsp->gp_seq - rdp->gp_seq);
+	ticks_value = rcu_seq_ctr(rcu_state.gp_seq - rdp->gp_seq);
 	if (ticks_value) {
 		ticks_title = "GPs behind";
 	} else {
@@ -1807,7 +1807,7 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu)
 	       rcu_dynticks_snap(rdtp) & 0xfff,
 	       rdtp->dynticks_nesting, rdtp->dynticks_nmi_nesting,
 	       rdp->softirq_snap, kstat_softirqs_cpu(RCU_SOFTIRQ, cpu),
-	       READ_ONCE(rsp->n_force_qs) - rsp->n_force_qs_gpstart,
+	       READ_ONCE(rcu_state.n_force_qs) - rcu_state.n_force_qs_gpstart,
 	       fast_no_hz);
 }