quoted

quoted

From fbdce972342437fb12703cae0c3a4f8f9e218a1b Mon Sep 17 00:00:00 2001
From: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Date: Mon, 30 Jun 2025 13:47:49 -0400
Subject: [PATCH] workqueue: relax condition in __queue_work()

Some cpumask search functions may return a number greater than
nr_cpu_ids when nothing is found. Adjust __queue_work() to it.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
---
 kernel/workqueue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 9f9148075828..abacfe157fe6 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c

@@ -2261,7 +2261,7 @@ static void __queue_work(int cpu, struct workqueue_struct *wq,
        rcu_read_lock();
 retry:
        /* pwq which will be used unless @work is executing elsewhere */
-       if (req_cpu == WORK_CPU_UNBOUND) {
+       if (req_cpu >= WORK_CPU_UNBOUND) {
                if (wq->flags & WQ_UNBOUND)
                        cpu = wq_select_unbound_cpu(raw_smp_processor_id());
                else

Seems reasonable to me... Maybe submit this to Tejun and CC me?

Sure, no problem.

Hmm... So, actually WORK_CPU_UNBOUND is NR_CPUS, which is not the same
as nr_cpu_ids. For example, on my Ubuntu machine, the CONFIG_NR_CPUS
is 8192, and nr_cpu_ids is 8.

So, for the wg_cpumask_next_online() to work properly, we need to
return the WORK_CPU_UNBOUND in case of nothing is found.

I think I need to send a v3...

Thanks,
Yury