sched: cleanup: remove unnecessary gotos

Replace loops implemented with gotos with real loops.
Replace err = ...; goto x; x: return err; with return ...;

No functional changes.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/sched.c

@@ -562,16 +562,13 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
 static inline struct rq *__task_rq_lock(struct task_struct *p)
 	__acquires(rq->lock)
 {
-	struct rq *rq;
-
-repeat_lock_task:
-	rq = task_rq(p);
+	for (;;) {
+		struct rq *rq = task_rq(p);
 		spin_lock(&rq->lock);
-	if (unlikely(rq != task_rq(p))) {
+		if (likely(rq == task_rq(p)))
+			return rq;
 		spin_unlock(&rq->lock);
-		goto repeat_lock_task;
 	}
-	return rq;
 }
 
 /*
@@ -584,15 +581,14 @@ static struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
 {
 	struct rq *rq;
 
-repeat_lock_task:
+	for (;;) {
 		local_irq_save(*flags);
 		rq = task_rq(p);
 		spin_lock(&rq->lock);
-	if (unlikely(rq != task_rq(p))) {
+		if (likely(rq == task_rq(p)))
+			return rq;
 		spin_unlock_irqrestore(&rq->lock, *flags);
-		goto repeat_lock_task;
 	}
-	return rq;
 }
 
 static void __task_rq_unlock(struct rq *rq)
@@ -1083,7 +1079,7 @@ void wait_task_inactive(struct task_struct *p)
 	int running, on_rq;
 	struct rq *rq;
 
-repeat:
+	for (;;) {
 		/*
 		 * We do the initial early heuristics without holding
 		 * any task-queue locks at all. We'll only try to get
@@ -1124,7 +1120,7 @@ repeat:
 		 */
 		if (unlikely(running)) {
 			cpu_relax();
-		goto repeat;
+			continue;
 		}
 
 		/*
@@ -1138,7 +1134,7 @@ repeat:
 		 */
 		if (unlikely(on_rq)) {
 			schedule_timeout_uninterruptible(1);
-		goto repeat;
+			continue;
 		}
 
 		/*
@@ -1146,6 +1142,8 @@ repeat:
 		 * runnable, which means that it will never become
 		 * running in the future either. We're all done!
 		 */
+		break;
+	}
 }
 
 /***
@@ -1236,7 +1234,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
 
 		/* Skip over this group if it has no CPUs allowed */
 		if (!cpus_intersects(group->cpumask, p->cpus_allowed))
-			goto nextgroup;
+			continue;
 
 		local_group = cpu_isset(this_cpu, group->cpumask);
 
@@ -1264,9 +1262,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
 			min_load = avg_load;
 			idlest = group;
 		}
-nextgroup:
-		group = group->next;
-	} while (group != sd->groups);
+	} while (group = group->next, group != sd->groups);
 
 	if (!idlest || 100*this_load < imbalance*min_load)
 		return NULL;
@@ -3517,8 +3513,9 @@ asmlinkage void __sched preempt_schedule(void)
 	if (likely(ti->preempt_count || irqs_disabled()))
 		return;
 
-need_resched:
+	do {
 		add_preempt_count(PREEMPT_ACTIVE);
+
 		/*
 		 * We keep the big kernel semaphore locked, but we
 		 * clear ->lock_depth so that schedule() doesnt
@@ -3534,10 +3531,12 @@ need_resched:
 #endif
 		sub_preempt_count(PREEMPT_ACTIVE);
 
-	/* we could miss a preemption opportunity between schedule and now */
+		/*
+		 * Check again in case we missed a preemption opportunity
+		 * between schedule and now.
+		 */
 		barrier();
-	if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
-		goto need_resched;
+	} while (unlikely(test_thread_flag(TIF_NEED_RESCHED)));
 }
 EXPORT_SYMBOL(preempt_schedule);
 
@@ -3557,8 +3556,9 @@ asmlinkage void __sched preempt_schedule_irq(void)
 	/* Catch callers which need to be fixed */
 	BUG_ON(ti->preempt_count || !irqs_disabled());
 
-need_resched:
+	do {
 		add_preempt_count(PREEMPT_ACTIVE);
+
 		/*
 		 * We keep the big kernel semaphore locked, but we
 		 * clear ->lock_depth so that schedule() doesnt
@@ -3576,10 +3576,12 @@ need_resched:
 #endif
 		sub_preempt_count(PREEMPT_ACTIVE);
 
-	/* we could miss a preemption opportunity between schedule and now */
+		/*
+		 * Check again in case we missed a preemption opportunity
+		 * between schedule and now.
+		 */
 		barrier();
-	if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
-		goto need_resched;
+	} while (unlikely(test_thread_flag(TIF_NEED_RESCHED)));
 }
 
 #endif /* CONFIG_PREEMPT */
@@ -4324,10 +4326,10 @@ asmlinkage long sys_sched_setparam(pid_t pid, struct sched_param __user *param)
 asmlinkage long sys_sched_getscheduler(pid_t pid)
 {
 	struct task_struct *p;
-	int retval = -EINVAL;
+	int retval;
 
 	if (pid < 0)
-		goto out_nounlock;
+		return -EINVAL;
 
 	retval = -ESRCH;
 	read_lock(&tasklist_lock);
@@ -4338,8 +4340,6 @@ asmlinkage long sys_sched_getscheduler(pid_t pid)
 			retval = p->policy;
 	}
 	read_unlock(&tasklist_lock);
-
-out_nounlock:
 	return retval;
 }
 
@@ -4352,10 +4352,10 @@ asmlinkage long sys_sched_getparam(pid_t pid, struct sched_param __user *param)
 {
 	struct sched_param lp;
 	struct task_struct *p;
-	int retval = -EINVAL;
+	int retval;
 
 	if (!param || pid < 0)
-		goto out_nounlock;
+		return -EINVAL;
 
 	read_lock(&tasklist_lock);
 	p = find_process_by_pid(pid);
@@ -4375,7 +4375,6 @@ asmlinkage long sys_sched_getparam(pid_t pid, struct sched_param __user *param)
 	 */
 	retval = copy_to_user(param, &lp, sizeof(*param)) ? -EFAULT : 0;
 
-out_nounlock:
 	return retval;
 
 out_unlock:
@@ -4731,11 +4730,11 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
 {
 	struct task_struct *p;
 	unsigned int time_slice;
-	int retval = -EINVAL;
+	int retval;
 	struct timespec t;
 
 	if (pid < 0)
-		goto out_nounlock;
+		return -EINVAL;
 
 	retval = -ESRCH;
 	read_lock(&tasklist_lock);
@@ -4763,8 +4762,8 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
 	read_unlock(&tasklist_lock);
 	jiffies_to_timespec(time_slice, &t);
 	retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;
-out_nounlock:
 	return retval;
+
 out_unlock:
 	read_unlock(&tasklist_lock);
 	return retval;
@@ -5070,7 +5069,7 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
 	struct rq *rq;
 	int dest_cpu;
 
-restart:
+	do {
 		/* On same node? */
 		mask = node_to_cpumask(cpu_to_node(dead_cpu));
 		cpus_and(mask, mask, p->cpus_allowed);
@@ -5097,8 +5096,7 @@ restart:
 				       "longer affine to cpu%d\n",
 				       p->pid, p->comm, dead_cpu);
 		}
-	if (!__migrate_task(p, dead_cpu, dest_cpu))
-		goto restart;
+	} while (!__migrate_task(p, dead_cpu, dest_cpu));
 }
 
 /*
@@ -5913,7 +5911,7 @@ static void init_numa_sched_groups_power(struct sched_group *group_head)
 
 	if (!sg)
 		return;
-next_sg:
+	do {
 		for_each_cpu_mask(j, sg->cpumask) {
 			struct sched_domain *sd;
 
@@ -5929,8 +5927,7 @@ next_sg:
 			sg_inc_cpu_power(sg, sd->groups->__cpu_power);
 		}
 		sg = sg->next;
-	if (sg != group_head)
-		goto next_sg;
+	} while (sg != group_head);
 }
 #endif