Hi,

I am using Ubuntu version 8.10 desktop. When i installed ubuntu from CD, it has installed with CONFIG_MODVERSIONS=y

Now the problem is i have my own driver, I have built it but the problem is

I have two a.ko and b.ko modules where b.ko has dependency on a.ko. Since CONFIG_MODVERSIONS will append some version information in the exported symbols. So when i am trying to do insmod b.ko, it is reporting me unknown symbol version.

I have read one tutorial that i will include modversions.h file in every c file before compilation. I did that but still i am getting the same error.

Can some body will tell what should i do to compile the kernel module when CONFIG_MODVSERSIONS is enabled.

Regards,
dinky

Are you sure that CONFIG_MODVERSIONS is your problem (check logs for the symbols in question, for instance use dmesg)? Does it work when this is disabled? Are you sure you are running the same kernel as you compile the module for? I mean *exactly* the same versions (including all additions to kernel version).

Hi Mara,

Really thanks for your quick reply. The problem is when i installed the ubuntu linux version 2.6.27-7-generic,the thing is I do not have source code for this ubuntu linux version kernel as i just had kernel headers.
Now when i tried to compile my kernel module, it is compiling successfully. When i did insmod as

insmod ./a.ko
it is successfully inserting it into existing kernel. since b.ko has dependencies on a.ko. So when i am doing like this..

insmod ./b.ko

it is failing and when i saw with dmesg, i am getting following output:

b: no symbol version for Register_Driver
b: unknown symbol Register_Driver

When i checked this error in more detail, i found that my existing kernel is compiled with CONFIG_MODVERSIONS.

So i have to include modversions.h file in every c file. But the problem is in ubuntu linux 8.04 version, modversions.h file is not there in the current distribution of ubuntu linux that i have.

So Now what should i do to compile my kernel module if CONFIG_MODVERSIONS is enabled. I have my standalone kernel module and i am trying to build it with same kernel that is installed using kernel source directory as kernel headers directory?

I do not have any kernel source just i am building my standalone kernel module.

So what should i do to get rid of this problem? Any help will be appreciated.

Regards,
dinky