GUC_LAST_ENGINE_CLASS
BUILD_BUG_ON(ARRAY_SIZE(guc_class_engine_class_map) != GUC_LAST_ENGINE_CLASS + 1);
GEM_BUG_ON(guc_class > GUC_LAST_ENGINE_CLASS);
u16 guc_class = GUC_LAST_ENGINE_CLASS + 1;
if (guc_class <= GUC_LAST_ENGINE_CLASS) {