These pernet_operations create and destroy per-net pipe
and dentry, and they seem safe to be marked as async.
Signed-off-by: NKirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: NAnna Schumaker <Anna.Schumaker@netapp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>