The following commit has been merged into the sched/core branch of tip: Commit-ID: 06249738a41a70f2201a148866899f84cbebc45e Gitweb: https://git.kernel.org/tip/06249738a41a70f2201a148866899f84cbebc45e Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> AuthorDate: Fri, 25 Sep 2020 15:45:11 +02:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Tue, 10 Nov 2020 18:38:58 +01:00 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) <peterz@xxxxxxxxxxxxx> Reviewed-by: Valentin Schneider <valentin.schneider@xxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> Reviewed-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> Link: https://lkml.kernel.org/r/20201023102346.464718669@xxxxxxxxxxxxx --- kernel/workqueue.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 437935e..c71da2a 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); /*
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