TTM_NUM_MEM_TYPES
struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES];
if (mem_type >= TTM_NUM_MEM_TYPES) {
if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
BUG_ON(type >= TTM_NUM_MEM_TYPES);
unsigned i = TTM_NUM_MEM_TYPES;