diff options
| -rw-r--r-- | kernel/workqueue.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 0ad24209221..0bc9ff0f8e8 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1920,6 +1920,15 @@ __acquires(&gcwq->lock) dump_stack(); } + /* + * The following prevents a kworker from hogging CPU on !PREEMPT + * kernels, where a requeueing work item waiting for something to + * happen could deadlock with stop_machine as such work item could + * indefinitely requeue itself while all other CPUs are trapped in + * stop_machine. + */ + cond_resched(); + spin_lock_irq(&gcwq->lock); /* clear cpu intensive status */ |