ptr_ring: document usage around __ptr_ring_peek
This explains why is the net usage of __ptr_ring_peek actually ok without locks. Signed-off-by:Michael S. Tsirkin <mst@redhat.com> Acked-by:
John Fastabend <john.fastabend@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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