Re: [PATCH 1/2] virtio: support unlocked queue poll

"Michael S. Tsirkin" [off-list ref] writes:

This adds a way to check ring empty state after enable_cb outside any
locks. Will be used by virtio_net.

Note: there's room for more optimization: caller is likely to have a
memory barrier already, which means we might be able to get rid of a
barrier here.  Deferring this optimization until we do some
benchmarking.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Acked-by: Rusty Russell <redacted>

Thanks,
Rusty.