hotplug_memory_notifier
hotplug_memory_notifier(kcore_callback, DEFAULT_CALLBACK_PRI);
hotplug_memory_notifier(kasan_mem_notifier, DEFAULT_CALLBACK_PRI);
hotplug_memory_notifier(ksm_memory_callback, KSM_CALLBACK_PRI);
hotplug_memory_notifier(mm_compute_batch_notifier, MM_COMPUTE_BATCH_PRI);
if (hotplug_memory_notifier(reserve_mem_notifier, DEFAULT_CALLBACK_PRI))
hotplug_memory_notifier(page_ext_callback, DEFAULT_CALLBACK_PRI);