This is a generic call and can be suceptible to races
in reading the wq task_list while another task is adding
itself to the list. Add a full barrier by using the
swq_has_sleeper() helper.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
virt/kvm/kvm_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6ed1c2021198..c41d903c5783 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2186,7 +2186,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
struct swait_queue_head *wqp;
wqp = kvm_arch_vcpu_wq(vcpu);
- if (swait_active(wqp)) {
+ if (swq_has_sleeper(wqp)) {
swake_up(wqp);
++vcpu->stat.halt_wakeup;
return true;
--
2.12.0
