[firefly] [PATCH] kernel:sched: renamed max_vruntime parameter

[Andrei Epure]

The min_vruntime variable actually stores the maximum value.
I added the comment for code readability.

Signed-off-by: Andrei Epure <epure.andrei at gmail.com>
---
 kernel/sched/fair.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3220639..a065d0f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -431,13 +431,13 @@ void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, unsigned long delta_exec);
  * Scheduling class tree data structure manipulation methods:
  */
 
-static inline u64 max_vruntime(u64 min_vruntime, u64 vruntime)
+static inline u64 max_vruntime(u64 max_vruntime, u64 vruntime)
 {
-	s64 delta = (s64)(vruntime - min_vruntime);
+	s64 delta = (s64)(vruntime - max_vruntime);
 	if (delta > 0)
-		min_vruntime = vruntime;
+		max_vruntime = vruntime;
 
-	return min_vruntime;
+	return max_vruntime;
 }
 
 static inline u64 min_vruntime(u64 min_vruntime, u64 vruntime)
@@ -473,6 +473,7 @@ static void update_min_vruntime(struct cfs_rq *cfs_rq)
 			vruntime = min_vruntime(vruntime, se->vruntime);
 	}
 
+	/* ensure we never gain time by being placed backwards. */
 	cfs_rq->min_vruntime = max_vruntime(cfs_rq->min_vruntime, vruntime);
 #ifndef CONFIG_64BIT
 	smp_wmb();
@@ -3576,7 +3577,7 @@ preempt:
 	 * point, either of which can * drop the rq lock.
 	 *
 	 * Also, during early boot the idle thread is in the fair class,
-	 * for obvious reasons its a bad idea to schedule back to it.
+	 * for obvious reasons it's a bad idea to schedule back to it.
 	 */
 	if (unlikely(!se->on_rq || curr == rq->idle))
 		return;
@@ -3785,7 +3786,7 @@ static bool yield_to_task_fair(struct rq *rq, struct task_struct *p, bool preemp
  *
  * w_i,j,k is the weight of the j-th runnable task in the k-th cgroup on cpu i.
  *
- * The big problem is S_k, its a global sum needed to compute a local (W_i)
+ * The big problem is S_k, it's a global sum needed to compute a local (W_i)
  * property.
  *
  * [XXX write more on how we solve this.. _after_ merging pjt's patches that
-- 
1.7.9.5