kgdb: has no line number information的問題

driver_new

我的driver makefile 如下：

DEBUG=y

CC = gcc

# Add your debugging flag (or not) to CFLAGS
ifeq ($(DEBUG),y)
  DEBFLAGS = -O -g  # "-O" is needed to expand inlines
else
  DEBFLAGS = -O2
endif
ccflags-y += $(DEBFLAGS)
ccflags-y += -I$(LDDINC)


ifneq ($(KERNELRELEASE),)
# call from kernel build system

df-objs := mod.o chr_dev.o

obj-m        := df.o

else

KERNELDIR ?= /lib/modules/$(shell uname -r)/build
PWD       := $(shell pwd)

modules:
        $(MAKE) -C $(KERNELDIR) M=$(PWD) LDDINC=$(PWD)/../include modules

endif



clean:
        rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions

depend .depend dep:
        $(CC) $(CFLAGS) -M *.c > .depend


ifeq (.depend,$(wildcard .depend))
include .depend
endif

看上去應(yīng)該是加了-g -O

將df.ko上傳到server， 并且insmod，獲得.text地址

在客戶機(jī)上開gdb, add-symbol-file /usr/src/kernels/test/my_driver/df.ko 0xffffffffa006f000  一切正常。
設(shè)置斷點(diǎn)。

當(dāng)kgdb運(yùn)行到斷點(diǎn)后，bt顯示正確，但按n后顯示Single stepping until exit from function df_ctldev__ioctl,
which has no line number information.

請(qǐng)問是哪里設(shè)置的問題？
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