While working on the nightmare governor for the Xperia XA2 Ultra (sdm660), I ran into this error: /home/alaskalinuxuser/aokp_pie/kernel/sony/sdm660/drivers/cpufreq/cpufreq_nightmare.c:714:3: error: implicit declaration of function ‘INIT_DELAYED_WORK_DEFERRABLE’ [-Werror,-Wimplicit-function-declaration] INIT_DELAYED_WORK_DEFERRABLE(&this_nightmare_cpuinfo->work, do_nightmare_timer); ^ /home/alaskalinuxuser/aokp_pie/kernel/sony/sdm660/drivers/cpufreq/cpufreq_nightmare.c:714:3: error: […]