-int PMPI_Cart_create(MPI_Comm comm_old, int ndims, const int* dims, const int* periodic, int reorder, MPI_Comm* comm_cart) {
- CHECK_COMM2(1, comm_old)
+int PMPI_Cart_create(MPI_Comm comm, int ndims, const int* dims, const int* periodic, int reorder, MPI_Comm* comm_cart) {
+ CHECK_COMM(1)