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vhost-net only uses memory barriers to control SMP effects (communication with userspace potentially running on a different CPU), so it should use SMP barriers and not mandatory barriers for memory access ordering, as suggested by Documentation/memory-barriers.txt Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>