[Qemu-devel] [PATCH] virtio-pci: drop unused wmb macro

["Michael S. Tsirkin" <mst@redhat.com>]

The implementation is wrong for kvm, and it's unused anyway.
Drop it.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-pci.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 87b78bc..f4db224 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -89,12 +89,6 @@
 /* Flags track per-device state like workarounds for quirks in older guests. */
 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG  (1 << 0)
 
-/* QEMU doesn't strictly need write barriers since everything runs in
- * lock-step.  We'll leave the calls to wmb() in though to make it obvious for
- * KVM or if kqemu gets SMP support.
- */
-#define wmb() do { } while (0)
-
 /* HACK for virtio to determine if it's running a big endian guest */
 bool virtio_is_big_endian(void);
 
-- 
MST