nn_pr
#define nn_err(nn, fmt, args...) nn_pr(nn, KERN_ERR, fmt, ## args)
#define nn_warn(nn, fmt, args...) nn_pr(nn, KERN_WARNING, fmt, ## args)
#define nn_info(nn, fmt, args...) nn_pr(nn, KERN_INFO, fmt, ## args)
#define nn_dbg(nn, fmt, args...) nn_pr(nn, KERN_DEBUG, fmt, ## args)