From 06249738a41a70f2201a148866899f84cbebc45e Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 25 Sep 2020 15:45:11 +0200 Subject: workqueue: Manually break affinity on hotplug 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) Reviewed-by: Valentin Schneider Acked-by: Tejun Heo Reviewed-by: Daniel Bristot de Oliveira Link: https://lkml.kernel.org/r/20201023102346.464718669@infradead.org --- kernel/workqueue.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'kernel/workqueue.c') diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 437935e7a199..c71da2a59e12 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -4908,6 +4908,10 @@ 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); /* -- cgit v1.2.3-59-g8ed1b