When is the KABI being kept on OEL with UEK and when not?

Hi,

We are developing device drivers for Linux, and specifically in this case for OEL with the UEK kernel.

We were wondering whether a driver we've compiled for a specific OEL 5.6 UEK kernel will work on OEL 5.5, OEL 5.7 or updates on the OEL 5.6 to the UEK kernel.

From a contact person in Oracle, we've got the answer that the UEK will be KABI compatible all the way long from OEL 5.5 with the first UEK kernel up to the latest OEL 6.2 with UEK kernel.

But as we are testing our driver which was built on OEL 5.6 with UEK kernel 2.6.32-100.26.2.el5 on OEL 5.7 with UEK kernel 2.6.32-300.4.1.el5uek we do get the following errors when trying to load our driver: