Merge tag 'fscache-fixes-for-ceph' into wip-fscache

Patches for Ceph FS-Cache support

1 files changed, 9 insertions, 0 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7f5d4be22034..e93f7b9067d8 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2201,6 +2201,15 @@ __acquires(&pool->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(&pool->lock);
 
 	/* clear cpu intensive status */