virtio_ring: Use const to annotate read-only pointer params

Add const to make the read-only pointer parameters clear, similar to
many existing functions.

To implement this change, the commit also introduces the use of
`container_of_const` to implement `to_vvq`, which ensures the const-ness
of read-only parameters and avoids accidental modification of their
members.

Signed-off-by: Feng Liu <[email protected]>
Reviewed-by: Jiri Pirko <[email protected]>
Reviewed-by: Parav Pandit <[email protected]>
Reviewed-by: Gavin Li <[email protected]>
Reviewed-by: Bodong Wang <[email protected]>

Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

0 files changed, 0 insertions, 0 deletions