IMPORTANT!Please note that after upgrading your source to or after 0e0fd600f4c75d4dc8a6d605ba9edc960d4f205e ("kernel/kobj: Put the default kobj_method inside the kobjop_desc struct."), you will have to do a full buildkernel.
quickkernel will succeed but the kernel will not work.Sorry for the inconvenience, but I had assumed quickkernel would not even compile.
Regards, Sascha