module_param does not work in Ubuntu 13.10 - Kernel 3.10.0-4

[binoy.jayan at wipro.com]

HI Sanmukh,

Thank you for testing the code. Yes I am using the same file and there is no typo. When I insert the module it inserts just fine.

In this case mystring takes the default value "blah" as seen in log below.

dmesg:

[ 7907.858933] Demonstrating module parameters
[ 7907.858937] ===============================
[ 7907.858939] myshort is a short integer: 1
[ 7907.858941] myint is an integer: 420
[ 7907.858943] mylong is a long integer: 9999
[ 7907.858945] mystring is a string: blah
[ 7907.858947] myintArray[0] = -1
[ 7907.858948] myintArray[1] = -1
[ 7907.858950] got 0 arguments for myintArray.

 I am wondering if there is an issue with the kernel version or the insmod utility.

Could you tell me what version of operating system and insmod you are using? I am using a development branch of Ubuntu.

$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu Saucy Salamander (development branch)
Release:    13.10
Codename:    saucy

$ insmod -V
kmod version 9


Thanks,
Binoy






































From: sanmukh rao [i.sanmukh at gmail.com]

Sent: Friday, September 06, 2013 10:37 AM

To: Binoy Jayan (WT01 - Manufacturing & Hi Tech)

Cc: kernelnewbies at kernelnewbies.org

Subject: Re: module_param does not work in Ubuntu 13.10 - Kernel 3.10.0-4







I have kernel 3.11.0-rc7 and it seems to be working fine. Are you sure the file attached is the correct one or there is no typo? See the output which I got compiling your file and loading it as a module in the attachment.





Thanks,

Sanmukh






On Thu, Sep 5, 2013 at 9:52 PM, <binoy.jayan at wipro.com>
 wrote:


Hi all,



I use the kernel version "3.10.0-4" that came with Ubuntu distribution.

When I compile the example module I got from LKMPG (hello-5.c) and try to load the driver by passing the module with the following command, it gives the following error:



# insmod parameter.ko mystring="bebop"

Error: could not insert module parameter.ko: Unknown symbol in module



Error in dmesg:



[ 3687.132110] parameter: Unknown parameter `mystring'



However, if I insert the module without any parameters, it gets inserted just fine.



# insmod parameter.ko



I am attaching the source code for reference. Kindly let me know what could be done.



Thanks,

Binoy































Regards,

Binoy Jayan

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