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-rw-r--r--kernel/rcu/tree_plugin.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 1b870d0d2445..b70cc91a7831 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2227,6 +2227,15 @@ static int __rcu_nocb_rdp_deoffload(struct rcu_data *rdp)
printk("De-offloading %d\n", rdp->cpu);
rcu_nocb_lock_irqsave(rdp, flags);
+ /*
+ * If there are still pending work offloaded, the offline
+ * CPU won't help much handling them.
+ */
+ if (cpu_is_offline(rdp->cpu) && !rcu_segcblist_empty(&rdp->cblist)) {
+ rcu_nocb_unlock_irqrestore(rdp, flags);
+ return -EBUSY;
+ }
+
rcu_segcblist_offload(cblist, false);
if (rdp->nocb_cb_sleep) {