From fee53323b677006531d9119aee46bddbbb33acaf Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 23 Oct 2020 12:12:03 +0200 Subject: [PATCH 006/296] workqueue: Manually break affinity on hotplug Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.35-rt39.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 1e2ca744dadb..c9a0c961d6e0 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -4912,6 +4912,10 @@ 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); /* -- 2.30.2