linux-kernel - [PATCH 30/34] sched_ext: Add scx_sched back pointer to scx_sched

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Message-ID: <20260121231140.832332-31-tj@kernel.org>
Date: Wed, 21 Jan 2026 13:11:36 -1000
From: Tejun Heo <tj@...nel.org>
To: linux-kernel@...r.kernel.org,
	sched-ext@...ts.linux.dev
Cc: void@...ifault.com,
	andrea.righi@...ux.dev,
	changwoo@...lia.com,
	emil@...alapatis.com,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 30/34] sched_ext: Add scx_sched back pointer to scx_sched_pcpu

Add a back pointer from scx_sched_pcpu to scx_sched. This will be used by
the next patch to make scx_bpf_reenqueue_local() sub-sched aware.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 kernel/sched/ext.c          | 3 +++
 kernel/sched/ext_internal.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index d58b2664f40a..d21a3f805704 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -5443,6 +5443,9 @@ static struct scx_sched *scx_alloc_and_add_sched(struct sched_ext_ops *ops,
 	for_each_possible_cpu(cpu)
 		init_dsq(bypass_dsq(sch, cpu), SCX_DSQ_BYPASS, sch);
 
+	for_each_possible_cpu(cpu)
+		per_cpu_ptr(sch->pcpu, cpu)->sch = sch;
+
 	sch->helper = kthread_run_worker(0, "sched_ext_helper");
 	if (IS_ERR(sch->helper)) {
 		ret = PTR_ERR(sch->helper);
diff --git a/kernel/sched/ext_internal.h b/kernel/sched/ext_internal.h
index 6ad1c00a72ba..cbe10672f6a4 100644
--- a/kernel/sched/ext_internal.h
+++ b/kernel/sched/ext_internal.h
@@ -933,6 +933,8 @@ struct scx_event_stats {
 	s64		SCX_EV_SUB_BYPASS_DISPATCH;
 };
 
+struct scx_sched;
+
 enum scx_sched_pcpu_flags {
 	SCX_SCHED_PCPU_BYPASSING	= 1LLU << 0,
 };
@@ -953,6 +955,7 @@ struct scx_dsp_ctx {
 };
 
 struct scx_sched_pcpu {
+	struct scx_sched	*sch;
 	u64			flags;	/* protected by rq lock */
 
 	/*
-- 
2.52.0