A.printk(KERN_ALERT"badjob!\n") B.printk(KERN_WARNING,"badjob!\n") C.printk(<1>"badjob!\n") D.printk(<4>,"badjob!\n")
A.gcc–o hello hello.c B.gcc–g hello.c–o hello C.gcc hello.c D.gcc–b hello.c–o hello
A.l B.n C.b D.c