Driver fails to compile on 4.2.0 kernel due to recent workqueue changes

Hello,

The Linux module fails to compile under Linux kernel 4.2 with recent changes to the work queue code.

This topic explains it pretty well and has a temporary workaround:

https://forums.geforce.com/default/topic/849487/linux-v4-2-uses-gpl-only-symbol-flush_workqueue-/