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From e3372f0d43a35f1070d1689e6aa1f84d6cd9784b Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 23 Oct 2020 12:12:03 +0200
Subject: [PATCH 006/323] workqueue: Manually break affinity on hotplug
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.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(+)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 63140e4dd5df..7c14773dc4c4 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4941,6 +4941,10 @@ 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);
/*
--
2.43.0
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