From e3372f0d43a35f1070d1689e6aa1f84d6cd9784b Mon Sep 17 00:00:00 2001 From: Peter Zijlstra 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) Acked-by: Tejun Heo Signed-off-by: Sebastian Andrzej Siewior --- 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