linux – 内核模块：hrtimer_start“模块中的未知符号”

make -C /lib/modules/3.0.0-23-server/build SUBDIRS=/home/projects/net-modeler modules
make[1]: Entering directory `/usr/src/linux-headers-3.0.0-23-server'
  CC [M]  /home/projects/net-modeler/nm_injector.o
  CC [M]  /home/projects/net-modeler/nm_scheduler.o
  LD [M]  /home/projects/net-modeler/net-modeler.o
  Building modules,stage 2.
  MODPOST 1 modules
  CC      /home/projects/net-modeler/net-modeler.mod.o
  LD [M]  /home/projects/net-modeler/net-modeler.ko
make[1]: Leaving directory `/usr/src/linux-headers-3.0.0-23-server'

…但是当我尝试insmod它时,dmesg输出

[111853.094925] Unknown symbol hrtimer_init (err 0)
[111853.094931] Unknown symbol hrtimer_start (err 0)
[111853.094942] Unknown symbol hrtimer_cancel (err 0)

这些函数在< linux / hrtimer.h>内部被激活,并在kernel / hrtimer.c中导出,如下所示：

/**
 * hrtimer_init - initialize a timer to the given clock
 * @timer:  the timer to be initialized
 * @clock_id: the clock to be used
 * @mode: timer mode abs/rel
 */
void hrtimer_init(struct hrtimer *timer,clockid_t clock_id,enum hrtimer_mode mode)
{
  debug_init(timer,clock_id,mode);
  __hrtimer_init(timer,mode);
}
EXPORT_SYMBOL_GPL(hrtimer_init);

cat / proc / kallsyms | grep< func>对于这三个函数导致：

0000000000000000 T hrtimer_init
0000000000000000 T hrtimer_cancel
0000000000000000 T hrtimer_start

任何人都可以帮我弄清楚发生了什么事吗？在我看来,所有的功能都是导出的,应该可以找到它们,但由于某些原因它们不是.我做了些蠢事吗？