rcu_queue: remove barrier from QLIST_EMPTY_RCU

It's unnecessary because the pointer isn't dereferenced.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <20180819091335.22863-3-cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/include/qemu/rcu_queue.h b/include/qemu/rcu_queue.h
index dd7b3be043eb5e685fdbee17ca90e27654bd7c9c..6881ea52747e70e76d70095aa22a6ffc7ce74234 100644 (file)
--- a/include/qemu/rcu_queue.h
+++ b/include/qemu/rcu_queue.h
@@ -36,7 +36,7 @@ extern "C" {
 /*
  * List access methods.
  */
-#define QLIST_EMPTY_RCU(head) (atomic_rcu_read(&(head)->lh_first) == NULL)
+#define QLIST_EMPTY_RCU(head) (atomic_read(&(head)->lh_first) == NULL)
 #define QLIST_FIRST_RCU(head) (atomic_rcu_read(&(head)->lh_first))
 #define QLIST_NEXT_RCU(elm, field) (atomic_rcu_read(&(elm)->field.le_next))