It looks like this change to the Linux kernel caused the break. Not knowing the purpose or scope of COMPAT, it's hard to say what it was meant to improve.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5180e3e24fd3e8e7ea46fbe21e10f5ea3fb1edaa -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1637059 Title: rtl8812au-dkms 4.3.8.12175.20140902+dfsg-0ubuntu2: rtl8812au kernel module failed to build [error: implicit declaration of function ‘is_compat_task’] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rtl8812au/+bug/1637059/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
