[PATCH v2 12/14] sched_ext: Factor out scx_dsq_list_node cursor initialization into INIT_DSQ_LIST_CURSOR

Tejun Heo
2025-11-10T20:56:50Z

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

Cc: Dan Schatzberg <schatzberg.dan@gmail.com>
Cc: Emil Tsalapatis <etsal@meta.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.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 4b501ad7a3fc..3f6bf2875431 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 d16525abf9e0..82f0d2202b99 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -6249,9 +6249,8 @@ __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;
}
--
2.51.2