bitstr_size
limit = MIN(len, bitstr_size(INPUT_PROP_CNT));
limit = MIN(len, bitstr_size(KEY_CNT));
limit = MIN(len, bitstr_size(LED_CNT));
limit = MIN(len, bitstr_size(SND_CNT));
limit = MIN(len, bitstr_size(SW_CNT));
limit = bitstr_size(limit);
return ((bitstr_t *)kmalloc(bitstr_size(_nbits), type, flags | M_ZERO));
return ((bitstr_t *)calloc(bitstr_size(_nbits), 1));
((name)[bitstr_size(nbits) / sizeof(bitstr_t)])
(bitstr_t *)calloc((size_t)bitstr_size(nbits), sizeof(bitstr_t))
((name)[bitstr_size(nbits)])