[RESEND PATCH] sched: Don't reinvent the wheel but use existing llist API

From: Byungchul Park
Date: Thu May 11 2017 - 20:39:55 EST


Although llist provides proper APIs, they are not used. Make them used.

Signed-off-by: Byungchul Park <byungchul.park@xxxxxxx>
---
kernel/sched/core.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d01f9d0..8938125 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1773,7 +1773,7 @@ void sched_ttwu_pending(void)
{
struct rq *rq = this_rq();
struct llist_node *llist = llist_del_all(&rq->wake_list);
- struct task_struct *p;
+ struct task_struct *p, *t;
unsigned long flags;
struct rq_flags rf;

@@ -1783,17 +1783,8 @@ void sched_ttwu_pending(void)
raw_spin_lock_irqsave(&rq->lock, flags);
rq_pin_lock(rq, &rf);

- while (llist) {
- int wake_flags = 0;
-
- p = llist_entry(llist, struct task_struct, wake_entry);
- llist = llist_next(llist);
-
- if (p->sched_remote_wakeup)
- wake_flags = WF_MIGRATED;
-
- ttwu_do_activate(rq, p, wake_flags, &rf);
- }
+ llist_for_each_entry_safe(p, t, llist, wake_entry)
+ ttwu_do_activate(rq, p, p->sched_remote_wakeup ? WF_MIGRATED : 0, &rf);

rq_unpin_lock(rq, &rf);
raw_spin_unlock_irqrestore(&rq->lock, flags);
--
1.9.1