The deprecation notices for direct p->scx.slice/dsq_vtime writes and for ops->cpu_acquire/release() use plain pr_warn(), so they repeat on every scheduler (re)load and flood the kernel log. The slice/dsq_vtime notice is emitted from the BPF verifier's btf_struct_access callback, which runs once per write access and is re-evaluated as the verifier explores paths, so loading a single scheduler can print it several times. The cpu_acquire/release notice is printed on every scheduler enable. Switch both to pr_warn_once() so each deprecation is reported a single time, and add the missing newline to the slice/dsq_vtime message. Signed-off-by: Breno Leitao --- kernel/sched/ext/ext.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/sched/ext/ext.c b/kernel/sched/ext/ext.c index 691d53fe0f648..708eb9024cb25 100644 --- a/kernel/sched/ext/ext.c +++ b/kernel/sched/ext/ext.c @@ -6988,7 +6988,7 @@ static int validate_ops(struct scx_sched *sch, const struct sched_ext_ops *ops) * run past the BPF allocation. Skip for cid-form. */ if (!sch->is_cid_type && (ops->cpu_acquire || ops->cpu_release)) - pr_warn("ops->cpu_acquire/release() are deprecated, use sched_switch TP instead\n"); + pr_warn_once("ops->cpu_acquire/release() are deprecated, use sched_switch TP instead\n"); /* * Sub-scheduler support is tied to the cid-form struct_ops. A sub-sched @@ -7806,7 +7806,7 @@ static int bpf_scx_btf_struct_access(struct bpf_verifier_log *log, off + size <= offsetofend(struct task_struct, scx.slice)) || (off >= offsetof(struct task_struct, scx.dsq_vtime) && off + size <= offsetofend(struct task_struct, scx.dsq_vtime))) { - pr_warn("sched_ext: Writing directly to p->scx.slice/dsq_vtime is deprecated, use scx_bpf_task_set_slice/dsq_vtime()"); + pr_warn_once("sched_ext: Writing directly to p->scx.slice/dsq_vtime is deprecated, use scx_bpf_task_set_slice/dsq_vtime()\n"); return SCALAR_VALUE; } --- base-commit: 4e5dfb7c84012007c3c7061126491bbc92d71bf1 change-id: 20260623-scx_warning-0df49c442afb Best regards, -- Breno Leitao