linux-kernel - [PATCH 12/13] sched_ext: Factor out scx_dsq_list_node cursor initialization into INIT_DSQ_LIST

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Message-ID: <20251109183112.2412147-13-tj@kernel.org>
Date: Sun,  9 Nov 2025 08:31:11 -1000
From: Tejun Heo <tj@...nel.org>
To: David Vernet <void@...ifault.com>,
	Andrea Righi <andrea.righi@...ux.dev>,
	Changwoo Min <changwoo@...lia.com>
Cc: Dan Schatzberg <schatzberg.dan@...il.com>,
	Emil Tsalapatis <etsal@...a.com>,
	sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 12/13] sched_ext: Factor out scx_dsq_list_node cursor initialization into INIT_DSQ_LIST_CURSOR

Factor out scx_dsq_list_node cursor initialization into INIT_DSQ_LIST_CURSOR
macro in preparation for additional users.

Cc: Dan Schatzberg <schatzberg.dan@...il.com>
Cc: Emil Tsalapatis <etsal@...a.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
---
 include/linux/sched/ext.h | 7 +++++++
 kernel/sched/ext.c        | 5 ++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched/ext.h b/include/linux/sched/ext.h
index 12561a3fcee4..280828b13608 100644
--- a/include/linux/sched/ext.h
+++ b/include/linux/sched/ext.h
@@ -149,6 +149,13 @@ struct scx_dsq_list_node {
 	u32			priv;		/* can be used by iter cursor */
 };
 
+#define INIT_DSQ_LIST_CURSOR(__node, __flags, __priv)				\
+	(struct scx_dsq_list_node) {						\
+		.node = LIST_HEAD_INIT((__node).node),				\
+		.flags = SCX_DSQ_LNODE_ITER_CURSOR | (__flags),			\
+		.priv = (__priv),						\
+	}
+
 /*
  * The following is embedded in task_struct and contains all fields necessary
  * for a task to be scheduled by SCX.
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index bd66178e5927..4b2cc6cc8cb2 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -6252,9 +6252,8 @@ __bpf_kfunc int bpf_iter_scx_dsq_new(struct bpf_iter_scx_dsq *it, u64 dsq_id,
 	if (!kit->dsq)
 		return -ENOENT;
 
-	INIT_LIST_HEAD(&kit->cursor.node);
-	kit->cursor.flags = SCX_DSQ_LNODE_ITER_CURSOR | flags;
-	kit->cursor.priv = READ_ONCE(kit->dsq->seq);
+	kit->cursor = INIT_DSQ_LIST_CURSOR(kit->cursor, flags,
+					   READ_ONCE(kit->dsq->seq));
 
 	return 0;
 }
-- 
2.51.1