Check patch tells me this is malformed should be:

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB

Apparently the WITH Linux-syscall-note is only used in uapi header
files.

+/*
+ * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */

And this is not a SPDX BSD-2-Clause license, this is the SPDX
Linux-OpenIB license.

Please be careful to use the correct tag with SPDX..

Also can you check if these SPDX tags are what are intended:

include/rdma/restrack.h:/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
drivers/infiniband/core/restrack.c:/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
drivers/infiniband/hw/mlx5/ib_rep.c:/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
drivers/infiniband/hw/mlx5/ib_rep.h:/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */

I'm not super excited about the license proliferation, so if they
should have been OR Linux-OpenIB as well then please send a patch.

Jason