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


From: Michael S. Tsirkin
Subject: [Qemu-devel] [PATCH] virtio-pci: drop unused wmb macro
Date: Thu, 30 May 2013 12:28:35 +0300

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

Signed-off-by: Michael S. Tsirkin <address@hidden>
Message-id: address@hidden
Signed-off-by: Anthony Liguori <address@hidden>
---
 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 70d2c6b..444b71a 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



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