[PATCH 2/4] Drivers: hv: ring_buffer: wrap around mappings for ring buffers

From: Vitaly Kuznetsov Make it possible to always use a single memcpy() or to provide a direct link to a packet on the ring buffer by creating virtual mapping for two copies of the ring buffer with vmap(). Utilize currently empty hv_ringbuffer_cleanup() to do the unmap. While on it, replace size

[PATCH 2/4] Drivers: hv: ring_buffer: wrap around mappings for ring buffers

Make it possible to always use a single memcpy() or to provide a direct link to a packet on the ring buffer by creating virtual mapping for two copies of the ring buffer with vmap(). Utilize currently empty hv_ringbuffer_cleanup() to do the unmap. While on it, replace sizeof(struct hv_ring_buffer)