c - error: implicit declaration of function 'create_proc_read_entry' [-Werror=implicit-function-declaration]

Question

I'm trying to compile a kernel module on kernel 3.13 and I get this error:

error: implicit declaration of function 'create_proc_read_entry' [-Werror=implicit-function-declaration] 

I google it and did not found any response. Here is the part of the code which refers to this error:

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
    proc = proc_net_create(KAODV_QUEUE_PROC_FS_NAME, 0, kaodv_queue_get_info);
#else
    proc = create_proc_read_entry(KAODV_QUEUE_PROC_FS_NAME, 0, init_net.proc_net, kaodv_queue_get_info, NULL);
#endif
    if (!proc) {
      printk(KERN_ERR "kaodv_queue: failed to create proc entry
");
      return -1;
    }

Can I get help ? I really don't know what is wrong. It might be the kernel 3.13 which needs a patch. I read somewhere (on KERNEL 3.10) that the kernel needs patch. Can anyone show me where can I get the 3.13 kernel patch to eventually fix the problem. Thanks

Answer 1

The error is because you are not including explicitly the header that declares the function and the compiler is 'including' implicitily for you and this throws a warning. The flag '-Werror' is making the compiler treats the warning as an error. Try adding: #include <linux/proc_fs.h>

Also: create_proc_read_entry is a deprecated function.

Take a look at: https://lkml.org/lkml/2013/4/11/215