[PATCH 07/15] sched_ext: Wrap deferred_reenq_local_node into a struct

[Tejun Heo]

Wrap the deferred_reenq_local_node list_head into struct
scx_deferred_reenq_local. More fields will be added and this allows using a
shorthand pointer to access them.

No functional change.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
 kernel/sched/ext.c          | 22 +++++++++++++---------
 kernel/sched/ext_internal.h |  6 +++++-
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index ffccaf04e34d..80d1e6ccc326 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -3648,15 +3648,19 @@ static void process_deferred_reenq_locals(struct rq *rq)
 		struct scx_sched *sch;
 
 		scoped_guard (raw_spinlock, &rq->scx.deferred_reenq_lock) {
-			struct scx_sched_pcpu *sch_pcpu =
+			struct scx_deferred_reenq_local *drl =
 				list_first_entry_or_null(&rq->scx.deferred_reenq_locals,
-							 struct scx_sched_pcpu,
-							 deferred_reenq_local_node);
-			if (!sch_pcpu)
+							 struct scx_deferred_reenq_local,
+							 node);
+			struct scx_sched_pcpu *sch_pcpu;
+
+			if (!drl)
 				return;
 
+			sch_pcpu = container_of(drl, struct scx_sched_pcpu,
+						deferred_reenq_local);
 			sch = sch_pcpu->sch;
-			list_del_init(&sch_pcpu->deferred_reenq_local_node);
+			list_del_init(&drl->node);
 		}
 
 		reenq_local(sch, rq);
@@ -4200,7 +4204,7 @@ static void scx_sched_free_rcu_work(struct work_struct *work)
 	for_each_possible_cpu(cpu) {
 		struct scx_sched_pcpu *pcpu = per_cpu_ptr(sch->pcpu, cpu);
 
-		WARN_ON_ONCE(!list_empty(&pcpu->deferred_reenq_local_node));
+		WARN_ON_ONCE(!list_empty(&pcpu->deferred_reenq_local.node));
 	}
 
 	free_percpu(sch->pcpu);
@@ -5813,7 +5817,7 @@ static struct scx_sched *scx_alloc_and_add_sched(struct sched_ext_ops *ops,
 		struct scx_sched_pcpu *pcpu = per_cpu_ptr(sch->pcpu, cpu);
 
 		pcpu->sch = sch;
-		INIT_LIST_HEAD(&pcpu->deferred_reenq_local_node);
+		INIT_LIST_HEAD(&pcpu->deferred_reenq_local.node);
 	}
 
 	sch->helper = kthread_run_worker(0, "sched_ext_helper");
@@ -8391,8 +8395,8 @@ __bpf_kfunc void scx_bpf_reenqueue_local___v2(const struct bpf_prog_aux *aux)
 	scoped_guard (raw_spinlock, &rq->scx.deferred_reenq_lock) {
 		struct scx_sched_pcpu *pcpu = this_cpu_ptr(sch->pcpu);
 
-		if (list_empty(&pcpu->deferred_reenq_local_node))
-			list_move_tail(&pcpu->deferred_reenq_local_node,
+		if (list_empty(&pcpu->deferred_reenq_local.node))
+			list_move_tail(&pcpu->deferred_reenq_local.node,
 				       &rq->scx.deferred_reenq_locals);
 	}
 
diff --git a/kernel/sched/ext_internal.h b/kernel/sched/ext_internal.h
index 80d40a9c5ad9..1a8d61097cab 100644
--- a/kernel/sched/ext_internal.h
+++ b/kernel/sched/ext_internal.h
@@ -954,6 +954,10 @@ struct scx_dsp_ctx {
 	struct scx_dsp_buf_ent	buf[];
 };
 
+struct scx_deferred_reenq_local {
+	struct list_head	node;
+};
+
 struct scx_sched_pcpu {
 	struct scx_sched	*sch;
 	u64			flags;	/* protected by rq lock */
@@ -965,7 +969,7 @@ struct scx_sched_pcpu {
 	 */
 	struct scx_event_stats	event_stats;
 
-	struct list_head	deferred_reenq_local_node;
+	struct scx_deferred_reenq_local deferred_reenq_local;
 	struct scx_dispatch_q	bypass_dsq;
 #ifdef CONFIG_EXT_SUB_SCHED
 	u32			bypass_host_seq;
-- 
2.53.0