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From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 23 Oct 2020 12:12:03 +0200
Subject: [PATCH 05/19] workqueue: Manually break affinity on hotplug
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.8-rt24.tar.xz
Don't rely on the scheduler to force break affinity for us -- it will
stop doing that for per-cpu-kthreads.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/workqueue.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4915,6 +4915,10 @@ static void unbind_workers(int cpu)
pool->flags |= POOL_DISASSOCIATED;
raw_spin_unlock_irq(&pool->lock);
+
+ for_each_pool_worker(worker, pool)
+ WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_active_mask) < 0);
+
mutex_unlock(&wq_pool_attach_mutex);
/*
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