Michael S. Tsirkin 79758e95d7 qemu/virtio: make wmb compiler barrier + comments ...

wmb must be at least a compiler barrier, even without SMP.
Further, we likely need some rmb()/mb() as well:
I have not audited the code but lguest has mb(),
add a comment for now.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

2009-10-30 08:39:34 -05:00

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