sched: Clean up some typos and grammatical errors in code/comments

Signed-off-by: Zhihui Zhang <zzhsuny@gmail.com>
Cc: peterz@infradead.org
Link: http://lkml.kernel.org/r/1411262676-19928-1-git-send-email-zzhsuny@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/core.c

@@ -8069,7 +8069,7 @@ static int tg_cfs_schedulable_down(struct task_group *tg, void *data)
 		struct cfs_bandwidth *parent_b = &tg->parent->cfs_bandwidth;
 
 		quota = normalize_cfs_quota(tg, d);
-		parent_quota = parent_b->hierarchal_quota;
+		parent_quota = parent_b->hierarchical_quota;
 
 		/*
 		 * ensure max(child_quota) <= parent_quota, inherit when no
@@ -8080,7 +8080,7 @@ static int tg_cfs_schedulable_down(struct task_group *tg, void *data)
 		else if (parent_quota != RUNTIME_INF && quota > parent_quota)
 			return -EINVAL;
 	}
-	cfs_b->hierarchal_quota = quota;
+	cfs_b->hierarchical_quota = quota;
 
 	return 0;
 }

kernel/sched/fair.c

@@ -2224,8 +2224,8 @@ static __always_inline u64 decay_load(u64 val, u64 n)
 
 	/*
 	 * As y^PERIOD = 1/2, we can combine
-	 *    y^n = 1/2^(n/PERIOD) * k^(n%PERIOD)
-	 * With a look-up table which covers k^n (n<PERIOD)
+	 *    y^n = 1/2^(n/PERIOD) * y^(n%PERIOD)
+	 * With a look-up table which covers y^n (n<PERIOD)
 	 *
 	 * To achieve constant time decay_load.
 	 */
@@ -6410,7 +6410,7 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
 		goto force_balance;
 
 	/*
-	 * If the local group is more busy than the selected busiest group
+	 * If the local group is busier than the selected busiest group
 	 * don't try and pull any tasks.
 	 */
 	if (local->avg_load >= busiest->avg_load)

kernel/sched/sched.h

@@ -188,7 +188,7 @@ struct cfs_bandwidth {
 	raw_spinlock_t lock;
 	ktime_t period;
 	u64 quota, runtime;
-	s64 hierarchal_quota;
+	s64 hierarchical_quota;
 	u64 runtime_expires;
 
 	int idle, timer_active;