RE: problem with registering net_dev

["Rajat Jain" <Rajat.Jain@xxxxxxxxxxxx>]

Hi Prasad,

The running kernel version has to EXACTLY match with the kernel source tree that you are compiling your module against. This includes the EXTRA_VERSION information in the makefile. For e.g, a running "2.6.9-5.EL" (Redhat) kernel won't be able to load a module compiled against 2.6.9.

Also, I think (but I'm not sure) that the compiler must be the same that was used in compiling the kernel. Can somebody please confirm this?

Thanks,

Rajat


-----Original Message-----
From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of prasad hegde
Sent: Thursday, July 05, 2007 7:05 AM
To: kernelnewbies
Subject: problem with registering net_dev


Hi,

I am a newbie trying to learn working of network device.
I was trying a stripped down version of snull.c example in ldd3

I am not able to load the module. 

dmesg says

 net_drive: disagrees about version of symbol alloc_netdev 
 net_drive: Unknown symbol alloc_netdev

Even though I am running 2.6.20 and my code is also compiled against 2.6.20, they both are different kernels.
Is this a problem, I dont think so.

My relevant code snippet is 

int snull_init_module(void)
{
        int result, i, ret = -ENOMEM;

         /* Allocate the devices */
        snull_devs[0] = alloc_netdev(sizeof(struct snull_priv), "sn%d",
                        snull_init); 
        snull_devs[1] = alloc_netdev(sizeof(struct snull_priv), "sn%d",
                        snull_init);
        if (snull_devs[0] == NULL || snull_devs[1] == NULL)
                goto out;
   
   out:
        if (ret)
           return ret;
}

void snull_init(struct net_device *dev )
{
        return;
}

module_init(snull_init_module);


Any help or pointers are appreciated.

Thanks
Prasad.

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