This is probably being caused by the following commit:
commit 4fbb658dd8ce96384852ceae18b0b09034de7b36 Author: Marcelo Henrique Cerri <email address hidden> Date: Mon Jun 11 18:22:54 2018 -0300
UBUNTU: [Config] azure: CONFIG_HOTPLUG_CPU=n
The lttng_hp_prepare and lttng_hp_online variables are declared inside a #ifdef block and are probably used somewhere else without the proper checking.
So this is a regression that needs to be fixed on the lttng dkms code.
This is probably being caused by the following commit:
commit 4fbb658dd8ce963 84852ceae18b0b0 9034de7b36
Author: Marcelo Henrique Cerri <email address hidden>
Date: Mon Jun 11 18:22:54 2018 -0300
UBUNTU: [Config] azure: CONFIG_ HOTPLUG_ CPU=n
The lttng_hp_prepare and lttng_hp_online variables are declared inside a #ifdef block and are probably used somewhere else without the proper checking.
So this is a regression that needs to be fixed on the lttng dkms code.