_BHNDB_HW_REQ_ARRAY
.hw_reqs = _BHNDB_HW_REQ_ARRAY(__VA_ARGS__), \
.num_hw_reqs = (sizeof(_BHNDB_HW_REQ_ARRAY(__VA_ARGS__)) / \
sizeof(_BHNDB_HW_REQ_ARRAY(__VA_ARGS__)[0])), \