I have not modified kcompat.h after complete re-installation of SUSE 11.1 and use of the kernel files that come with the LiveCD.
I know the driver works on the HP hardware with other flavors Linux - I got it to compile under CentOS and we had network connectivity- we are working to switch our imaging pre-boot infrastructure over to one where this driver compiles. But we have many servers to changes . Had hoped we could get it to compile under 2.6.27.7 also.