今天编写一个hello的驱动模块，但对于makefile很郁闷

只看该作者 · 2012-9-9 21:04

源码：
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>

#define DEVICE_NAME "myfrisr_dev_hello"
#define HELLO_MAJOR 45
static int myfrist_dev_open(struct inode *inode,struct file *file)
  {
printk("come here I am here \n");
printk("");
return 0;
  }
static ssize_t myfrist_dev_write(struct file *file,const char __user *buf,size_t count, loff_t *ppos)
{
printk("i will go ,thank you \n");
  return 0;
}
static struct file_operations myfrist_dev_fops={
.owner = THIS_MODULE,
.open = myfrist_dev_open,
.write = myfrist_dev_write,
};
static int __init myfrist_dev_hello_init(void)
{
int ret;

ret = register_chrdev(HELLO_MAJOR,DEVICE_NAME,&myfrist_dev_fops );
  if(ret<0)
{
   printk(DEVICE_NAME "canot register major number");
   return ret;
}
printk(DEVICE_NAME"init yes \n");
return 0;
}
static void __exit myfrist_dev_hello_exit(void)
{
  unregister_chrdev(HELLO_MAJOR,DEVICE_NAME);
}

module_init(myfrist_dev_hello_init);
module_exit(myfrist_dev_hello_exit);
MODULE_LICENSE("GPL");

自己写了一个Makefile
NEL_DIR=/home/a123/lx/linux-2.6.30.4/
all:
make -C $(NEL_DIR) M=$(pwd) modules

obj-m += frist_driver_hello.o

clean:
rm -rf *.bak *.mod* *or* *.sym* *.ko *.o
但make后
出现如下：
[email=root@a123-virtual-machine:/mnt/hgfs/Win/ARMEXP/frist_driver_hello]root@a123-virtual-machine:/mnt/hgfs/Win/ARMEXP/frist_driver_hello[/email]# make
make -C /home/a123/lx/linux-2.6.30.4/ M= modules
make[1]: Entering directory `/home/a123/lx/linux-2.6.30.4'
  CHK    include/linux/version.h
make[2]: `include/asm-arm/mach-types.h' is up to date.
  CHK    include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-arm
  CALL scripts/checksyscalls.sh
<stdin>:1097:2: warning: #warning syscall fadvise64 not implemented
<stdin>:1265:2: warning: #warning syscall migrate_pages not implemented
<stdin>:1321:2: warning: #warning syscall pselect6 not implemented
<stdin>:1325:2: warning: #warning syscall ppoll not implemented
<stdin>:1365:2: warning: #warning syscall epoll_pwait not implemented
  Building modules, stage 2.
  MODPOST 413 modules
make[1]: Leaving directory `/home/a123/lx/linux-2.6.30.4'
[email=root@a123-virtual-machine:/mnt/hgfs/Win/ARMEXP/frist_driver_hello]root@a123-virtual-machine:/mnt/hgfs/Win/ARMEXP/frist_driver_hello[/email]#
并没有编译出想要的.ko文件，

然后我使用 make -C /home/a123/lx/linux-2.6.30.4/ M=$(pwd) modules却能编译出.ko文件，这是为什么，请大侠指点一下吧我郁闷一天啦