[PATCH] KVM: eventfd: Remove redundant synchronize_srcu_expedited from irqfd assignment

[lirongqing]

From: Li RongQing <lirongqing@xxxxxxxxx>

The synchronize_srcu_expedited() call in kvm_irqfd_assign() is unnecessary
when adding a new irqfd to the resampler list. The list insertion is
already RCU-safe, and existing readers will either see the old or the
updated list without inconsistency. Removing this call reduces latency
during resampling irqfd setup.

Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
---
 virt/kvm/eventfd.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 3201f60..facfeab 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -450,7 +450,6 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 		}
 
 		list_add_rcu(&irqfd->resampler_link, &irqfd->resampler->list);
-		synchronize_srcu_expedited(&kvm->irq_srcu);
 
 		mutex_unlock(&kvm->irqfds.resampler_lock);
 	}
-- 
2.9.4