From: Johnlay Park <jonglae.park@samsung.com>
Date: Mon, 16 Apr 2018 05:53:28 +0000 (+0900)
Subject: [COMMON] sched/rt: remove the useless rq lock
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=77142f199ab3c236c99146ea0743c923ee47c888;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] sched/rt: remove the useless rq lock

in find_lock_lowest_rq(). In an aging test, rq lock is unbalanced,
because the rq lock is released in double locking routine in
this function from rto_push_irq_work_func.

Change-Id: I338bc98fd4053aefcf8fdd4a6e991ce240d649ec
Signed-off-by: Johnlay Park <jonglae.park@samsung.com>
---

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 66155bc47aab..bea7bef36667 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2546,15 +2546,6 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
 			break;
 
 		lowest_rq = cpu_rq(cpu);
-#ifdef CONFIG_SCHED_USE_FLUID_RT
-		if (task->rt.sync_flag == 1 && lowest_rq->rt.highest_prio.curr == task->prio) {
-			/*
-			 * If the sync flag is set,
-			 * let the task go even though its priority is same with current.
-			 */
-			trace_sched_fluid_stat(task, &task->rt.avg, cpu, "SYNC AGAIN");
-		} else
- #else
 		if (lowest_rq->rt.highest_prio.curr <= task->prio)
 		{
 			/*
@@ -2565,7 +2556,6 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
 			lowest_rq = NULL;
 			break;
 		}
-#endif
 
 		/* if the prio of this runqueue changed, try again */
 		if (double_lock_balance(rq, lowest_rq)) {