echo Y > /sys/module/printk/parameters/time //打开内核日志打印时间

echo N > /sys/module/printk/parameters/time  //关闭内核日志打印时间

cat /sys/module/printk/parameters/time //查看内核日志打印时间开关状态

static bool printk_time = IS_ENABLED(CONFIG_PRINTK_TIME);
module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);