sched/deadline: Use __node_2_[pdl|dle]() and rb_first_cached() consistently

Deploy __node_2_pdl(node), __node_2_dle(node) and rb_first_cached()
consistently throughout the sched class source file which makes the
code at least easier to read.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lore.kernel.org/r/20220302183433.333029-5-dietmar.eggemann@arm.com

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index de677b1..3242dd4 100644 (file)
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -450,7 +450,7 @@ static inline int is_leftmost(struct task_struct *p, struct dl_rq *dl_rq)
 {
        struct sched_dl_entity *dl_se = &p->dl;
 
-       return dl_rq->root.rb_leftmost == &dl_se->rb_node;
+       return rb_first_cached(&dl_rq->root) == &dl_se->rb_node;
 }
 
 static void init_dl_rq_bw_ratio(struct dl_rq *dl_rq);
@@ -1433,6 +1433,9 @@ void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se)
        timer->function = inactive_task_timer;
 }
 
+#define __node_2_dle(node) \
+       rb_entry((node), struct sched_dl_entity, rb_node)
+
 #ifdef CONFIG_SMP
 
 static void inc_dl_deadline(struct dl_rq *dl_rq, u64 deadline)
@@ -1462,10 +1465,9 @@ static void dec_dl_deadline(struct dl_rq *dl_rq, u64 deadline)
                cpudl_clear(&rq->rd->cpudl, rq->cpu);
                cpupri_set(&rq->rd->cpupri, rq->cpu, rq->rt.highest_prio.curr);
        } else {
-               struct rb_node *leftmost = dl_rq->root.rb_leftmost;
-               struct sched_dl_entity *entry;
+               struct rb_node *leftmost = rb_first_cached(&dl_rq->root);
+               struct sched_dl_entity *entry = __node_2_dle(leftmost);
 
-               entry = rb_entry(leftmost, struct sched_dl_entity, rb_node);
                dl_rq->earliest_dl.curr = entry->deadline;
                cpudl_set(&rq->rd->cpudl, rq->cpu, entry->deadline);
        }
@@ -1506,9 +1508,6 @@ void dec_dl_tasks(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
        dec_dl_migration(dl_se, dl_rq);
 }
 
-#define __node_2_dle(node) \
-       rb_entry((node), struct sched_dl_entity, rb_node)
-
 static inline bool __dl_less(struct rb_node *a, const struct rb_node *b)
 {
        return dl_time_before(__node_2_dle(a)->deadline, __node_2_dle(b)->deadline);
@@ -1979,7 +1978,7 @@ static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
        if (!left)
                return NULL;
 
-       return rb_entry(left, struct sched_dl_entity, rb_node);
+       return __node_2_dle(left);
 }
 
 static struct task_struct *pick_task_dl(struct rq *rq)
@@ -2074,15 +2073,17 @@ static int pick_dl_task(struct rq *rq, struct task_struct *p, int cpu)
  */
 static struct task_struct *pick_earliest_pushable_dl_task(struct rq *rq, int cpu)
 {
-       struct rb_node *next_node = rq->dl.pushable_dl_tasks_root.rb_leftmost;
        struct task_struct *p = NULL;
+       struct rb_node *next_node;
 
        if (!has_pushable_dl_tasks(rq))
                return NULL;
 
+       next_node = rb_first_cached(&rq->dl.pushable_dl_tasks_root);
+
 next_node:
        if (next_node) {
-               p = rb_entry(next_node, struct task_struct, pushable_dl_tasks);
+               p = __node_2_pdl(next_node);
 
                if (pick_dl_task(rq, p, cpu))
                        return p;
@@ -2248,8 +2249,7 @@ static struct task_struct *pick_next_pushable_dl_task(struct rq *rq)
        if (!has_pushable_dl_tasks(rq))
                return NULL;
 
-       p = rb_entry(rq->dl.pushable_dl_tasks_root.rb_leftmost,
-                    struct task_struct, pushable_dl_tasks);
+       p = __node_2_pdl(rb_first_cached(&rq->dl.pushable_dl_tasks_root));
 
        BUG_ON(rq->cpu != task_cpu(p));
        BUG_ON(task_current(rq, p));