rcu: Fix code-style issues involving "else"

The Linux kernel coding style says that single-statement blocks should
omit curly braces unless the other leg of the "if" statement has
multiple statements, in which case the curly braces should be included.
This commit fixes RCU's violations of this rule.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

kernel/rcutiny_plugin.h

@@ -350,8 +350,9 @@ static int rcu_initiate_boost(void)
 			rcu_preempt_ctrlblk.boost_tasks =
 				rcu_preempt_ctrlblk.gp_tasks;
 		invoke_rcu_callbacks();
-	} else
+	} else {
 		RCU_TRACE(rcu_initiate_boost_trace());
+	}
 	return 1;
 }
 
@@ -778,9 +779,9 @@ void synchronize_rcu_expedited(void)
 		rpcp->exp_tasks = NULL;
 
 	/* Wait for tail of ->blkd_tasks list to drain. */
-	if (!rcu_preempted_readers_exp())
+	if (!rcu_preempted_readers_exp()) {
 		local_irq_restore(flags);
-	else {
+	} else {
 		rcu_initiate_boost();
 		local_irq_restore(flags);
 		wait_event(sync_rcu_preempt_exp_wq,

kernel/rcutorture.c

@@ -408,8 +408,9 @@ rcu_torture_cb(struct rcu_head *p)
 	if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) {
 		rp->rtort_mbtest = 0;
 		rcu_torture_free(rp);
-	} else
+	} else {
 		cur_ops->deferred_free(rp);
+	}
 }
 
 static int rcu_no_completed(void)

kernel/rcutree.c

@@ -892,8 +892,9 @@ static void __note_new_gpnum(struct rcu_state *rsp, struct rcu_node *rnp, struct
 		if (rnp->qsmask & rdp->grpmask) {
 			rdp->qs_pending = 1;
 			rdp->passed_quiesce = 0;
-		} else
+		} else {
 			rdp->qs_pending = 0;
+		}
 		zero_cpu_stall_ticks(rdp);
 	}
 }
@@ -2130,9 +2131,9 @@ void synchronize_sched_expedited(void)
 		put_online_cpus();
 
 		/* No joy, try again later.  Or just synchronize_sched(). */
-		if (trycount++ < 10)
+		if (trycount++ < 10) {
 			udelay(trycount * num_online_cpus());
-		else {
+		} else {
 			synchronize_sched();
 			return;
 		}

kernel/rcutree_plugin.h

@@ -390,8 +390,9 @@ void rcu_read_unlock_special(struct task_struct *t)
 							 rnp->grphi,
 							 !!rnp->gp_tasks);
 			rcu_report_unblock_qs_rnp(rnp, flags);
-		} else
+		} else {
 			raw_spin_unlock_irqrestore(&rnp->lock, flags);
+		}
 
 #ifdef CONFIG_RCU_BOOST
 		/* Unboost if we were boosted. */
@@ -757,9 +758,9 @@ sync_rcu_preempt_exp_init(struct rcu_state *rsp, struct rcu_node *rnp)
 	int must_wait = 0;
 
 	raw_spin_lock_irqsave(&rnp->lock, flags);
-	if (list_empty(&rnp->blkd_tasks))
+	if (list_empty(&rnp->blkd_tasks)) {
 		raw_spin_unlock_irqrestore(&rnp->lock, flags);
-	else {
+	} else {
 		rnp->exp_tasks = rnp->blkd_tasks.next;
 		rcu_initiate_boost(rnp, flags);  /* releases rnp->lock */
 		must_wait = 1;
@@ -803,9 +804,9 @@ void synchronize_rcu_expedited(void)
 	 * expedited grace period for us, just leave.
 	 */
 	while (!mutex_trylock(&sync_rcu_preempt_exp_mutex)) {
-		if (trycount++ < 10)
+		if (trycount++ < 10) {
 			udelay(trycount * num_online_cpus());
-		else {
+		} else {
 			synchronize_rcu();
 			return;
 		}
@@ -2093,8 +2094,9 @@ static void rcu_prepare_for_idle(int cpu)
 	if (rcu_cpu_has_callbacks(cpu)) {
 		trace_rcu_prep_idle("More callbacks");
 		invoke_rcu_core();
-	} else
+	} else {
 		trace_rcu_prep_idle("Callbacks drained");
+	}
 }
 
 /*