workqueue: swap set_cpus_allowed_ptr() and PF_NO_SETAFFINITY
Move the setting of PF_NO_SETAFFINITY up before set_cpus_allowed()
in create_worker(). Otherwise userland can change ->cpus_allowed
in between.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 987293d..f894242 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1736,16 +1736,17 @@
if (IS_ERR(worker->task))
goto fail;
+ set_user_nice(worker->task, pool->attrs->nice);
+
+ /* prevent userland from meddling with cpumask of workqueue workers */
+ worker->task->flags |= PF_NO_SETAFFINITY;
+
/*
* set_cpus_allowed_ptr() will fail if the cpumask doesn't have any
* online CPUs. It'll be re-applied when any of the CPUs come up.
*/
- set_user_nice(worker->task, pool->attrs->nice);
set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask);
- /* prevent userland from meddling with cpumask of workqueue workers */
- worker->task->flags |= PF_NO_SETAFFINITY;
-
/*
* The caller is responsible for ensuring %POOL_DISASSOCIATED
* remains stable across this function. See the comments above the
