printk的8个loglevel

在<linux/kernel.h>中定义

#define    KERN_EMERG    "<0>"    /* system is unusable           */
#define    KERN_ALERT    "<1>"   /* action must be taken immediately*/
#define    KERN_CRIT    "<2>"    /* critical conditions    */
#define    KERN_ERR    "<3>"    /* error conditions            */
#define    KERN_WARNING    "<4>"    /* warning conditions   */
#define    KERN_NOTICE    "<5>"    /* normal but significant condition */
#define    KERN_INFO    "<6>"    /* informational            */
#define    KERN_DEBUG    "<7>"    /* debug-level messages   */

在