KERN_ERR
__drm_dev_vprintk(NULL, KERN_ERR, __builtin_return_address(0), "*ERROR*", &vaf);
printk(KERN_ERR "[" DRM_NAME "] *ERROR* ");
loglevel = KERN_ERR;
drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
#define pr_err(fmt, arg...) printk(KERN_ERR pr_fmt(fmt), ## arg)
#define pr_err_once(fmt, arg...) printk_once(KERN_ERR pr_fmt(fmt), ## arg)