(2)
the 'p' (task_struct) parameter in the sched_class :: yield_task()
is redundant as the caller is always the 'current'. Get rid of it.
Signed-off-by: Dmitry Adamushko <[email protected]>
---
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 9fd936f..3728cd6 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -857,7 +857,7 @@ struct sched_class {
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
- void (*yield_task) (struct rq *rq, struct task_struct *p);
+ void (*yield_task) (struct rq *rq);
void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
diff --git a/kernel/sched.c b/kernel/sched.c
index 046dae1..361fad8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4535,7 +4535,7 @@ asmlinkage long sys_sched_yield(void)
if (unlikely(rq->nr_running == 1))
schedstat_inc(rq, yld_act_empty);
else
- current->sched_class->yield_task(rq, current);
+ current->sched_class->yield_task(rq);
/*
* Since we are going to call schedule() anyway, there's
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5a244e2..9b982ef 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -723,10 +723,12 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep)
/*
* sched_yield() support is very simple - we dequeue and enqueue
*/
-static void yield_task_fair(struct rq *rq, struct task_struct *p)
+static void yield_task_fair(struct rq *rq)
{
+ struct task_struct *curr = rq->curr;
+ struct cfs_rq *cfs_rq = task_cfs_rq(curr);
+
if (!sysctl_sched_yield_bug_workaround) {
- struct cfs_rq *cfs_rq = task_cfs_rq(p);
__update_rq_clock(rq);
/*
@@ -737,7 +739,6 @@ static void yield_task_fair(struct rq *rq, struct task_struct *p)
}
if (sysctl_sched_yield_bug_workaround == 1) {
- struct cfs_rq *cfs_rq = task_cfs_rq(p);
struct sched_entity *next;
/*
@@ -757,7 +758,7 @@ static void yield_task_fair(struct rq *rq, struct task_struct *p)
/*
* Minimally necessary key value to be the second in the tree:
*/
- p->se.vruntime = next->vruntime +
+ curr->se.vruntime = next->vruntime +
sysctl_sched_yield_granularity;
/*
@@ -770,7 +771,7 @@ static void yield_task_fair(struct rq *rq, struct task_struct *p)
/*
* Just reschedule, do nothing else:
*/
- resched_task(p);
+ resched_task(curr);
}
/*
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 45b339f..b86944c 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -59,9 +59,9 @@ static void requeue_task_rt(struct rq *rq, struct task_struct *p)
}
static void
-yield_task_rt(struct rq *rq, struct task_struct *p)
+yield_task_rt(struct rq *rq)
{
- requeue_task_rt(rq, p);
+ requeue_task_rt(rq, rq->curr);
}
/*
---
Dmitry
-
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