编译linux-2.6.36时，出现的警告。

loki

fs/autofs/root.c:30: warning: ‘autofs_root_compat_ioctl’ declared ‘static’ but never defined

这是什么意思？谢谢!

stesen

2. #ifdef CONFIG_COMPAT
3. static long autofs_root_compat_ioctl(struct file *filp,
4.                              unsigned int cmd, unsigned long arg)
5. {
6.         struct inode *inode = filp->f_path.dentry->d_inode;
7.         int ret;
9.         lock_kernel();
10.         if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
11.                 ret = autofs_do_root_ioctl(inode, filp, cmd, arg);
12.         else
13.                 ret = autofs_do_root_ioctl(inode, filp, cmd,
14.                         (unsigned long)compat_ptr(arg));
15.         unlock_kernel();
17.         return ret;
18. }
19. #endif

复制代码

被ifdef包起来了,应该再加上else,然后只return 0