workqueue: respect isolated cpus when queueing an unbound work

Initialize wq_unbound_cpumask to exclude cpus that were isolated by
the cmdline's isolcpus parameter.

Signed-off-by: Tal Shorer <tal.shorer@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 64d0edf428f8..bfa433b38a61 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4980,6 +4980,10 @@ int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
         if (!zalloc_cpumask_var(&saved_cpumask, GFP_KERNEL))
                 return -ENOMEM;
 
+        /*
+         * Not excluding isolated cpus on purpose.
+         * If the user wishes to include them, we allow that.
+         */
         cpumask_and(cpumask, cpumask, cpu_possible_mask);
         if (!cpumask_empty(cpumask)) {
                 apply_wqattrs_lock();
@@ -5579,7 +5583,7 @@ int __init workqueue_init_early(void)
         WARN_ON(__alignof__(struct pool_workqueue) < __alignof__(long long));
 
         BUG_ON(!alloc_cpumask_var(&wq_unbound_cpumask, GFP_KERNEL));
-        cpumask_copy(wq_unbound_cpumask, cpu_possible_mask);
+        cpumask_andnot(wq_unbound_cpumask, cpu_possible_mask, cpu_isolated_map);
 
         pwq_cache = KMEM_CACHE(pool_workqueue, SLAB_PANIC);