What happened to ....

I'm rebuilding a driver I've written for AHCI on RHEL7. It built well on 7.0 and 7.1. However, on 7.2 I get these:

WARNING: "ahci_hw_interrupt" [/devel/vmshare/dm3-ahci/dm_ahci/ahci.ko] undefined!
WARNING: "ahci_interrupt" [/devel/vmshare/dm3-ahci/dm_ahci/ahci.ko] undefined!
WARNING: "ahci_thread_fn" [/devel/vmshare/dm3-ahci/dm_ahci/ahci.ko] undefined!

Indeed, inspecing /proc/kallsyms shows they're not there. So, what happened to them? I'm searching through the archives of this list now, but all I've uncovered are a couple of threads mentioning that there is a possibility one could crash the system if the port isn't real.

What should be used in their place?

Andy