insmod: Invalid module format (2.6.4-52-default, gcc-3.3.3)

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I am writing a simple character device driver on a 2.6.4.52 suse 9.1
kernel. It does not do much; basically just initialises the module,
runs a few checks and then exits the module. When I try to insert the
module, I get the following error:

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

Now, here is the deal:

My kernel build is for the same version that 'modinfo chardriver.ko'
gives me. Also, I copied over /boot/config-2.6.4-52-default  to 
/usr/src/linux-2.6.4-52-default/.config.

/lib/modules/2.6.4-52-default/build/include/linux/version.h  defines
my version as

#define UTS_RELEASE "2.6.4-52-default" 

which is what I get with modinfo chardriver.ko

What am I doing wrong?

Thanks,
Hemant Mohapatra

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