insmod: error inserting './hello.ko': -1 Invalid module format

Hello sir,

I have latest kernel 2.6.38.6 and working on mandriva. Now i am trying with example hello world as available in book (linux device driver by Rubini, corbet)
But I am surprised here "insmod" is not supporting ".ko " file format. previously i was working by this method only.
so please give me solution with explanation( if possible)
Exact error is mentioned here for reference

root@localhost ldd]# make make -C /home/dipan/linux/linux-2.6.38.6 SUBDIRS=/home/dipan/ldd modules make[1]: Entering directory `/home/dipan/linux/linux-2.6.38.6' Building modules, stage 2. MODPOST 1 modules make[1]: Leaving directory `/home/dipan/linux/linux-2.6.38.6' [root@localhost ldd]# insmod ./hello.ko insmod: error inserting './hello.ko': -1 Invalid module format

Thank you
[EMAIL="modipan@gmail.com"]

...the only thing I can come up with is that the module you made does not have the expected format, hence is not accepted as a kernel module...

I flipped tru the book, are you at page 15? The output is hello.o and not hello.ko, maybe a compile setting error?

Device drivers/kernel modules. The latter has KO as extention...read up on an other page...

Luck!

Thor

thanks for replying sir,

i got hint from another thread same like this.

dmesg:
module: disagrees about version of symbol struct_module

it was different kernel version.

now i am able to insert the module.

Great!

Good luck with the studies!

Thor