linux-kernel - [PATCH] infiniband: mlx5: fix build error when INFINIBAND_USER

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Date:   Mon, 16 Apr 2018 14:21:07 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Matan Barak <matanb@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Doug Ledford <dledford@...hat.com>
Subject: [PATCH] infiniband: mlx5: fix build error when
 INFINIBAND_USER_ACCESS=m

From: Randy Dunlap <rdunlap@...radead.org>

Fix build errors when INFINIBAND_USER_ACCESS=m and MLX5_INFINIBAND=y.
The build error occurs when the mlx5 driver code attempts to use
USER_ACCESS interfaces, which are built as a loadable module.

Fixes these build errors:

drivers/infiniband/hw/mlx5/main.o: In function `populate_specs_root':
../drivers/infiniband/hw/mlx5/main.c:4982: undefined reference to `uverbs_default_get_objects'
../drivers/infiniband/hw/mlx5/main.c:4994: undefined reference to `uverbs_alloc_spec_tree'
drivers/infiniband/hw/mlx5/main.o: In function `depopulate_specs_root':
../drivers/infiniband/hw/mlx5/main.c:5001: undefined reference to `uverbs_free_spec_tree'

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Matan Barak <matanb@...lanox.com>
Cc: Jason Gunthorpe <jgg@...lanox.com>
Cc: Leon Romanovsky <leonro@...lanox.com>
Cc: Doug Ledford <dledford@...hat.com>
Cc: linux-rdma@...r.kernel.org
Cc: stable@...r.kernel.org # reported against 4.16
---
 drivers/infiniband/hw/mlx5/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- lnx-417-rc1.orig/drivers/infiniband/hw/mlx5/Kconfig
+++ lnx-417-rc1/drivers/infiniband/hw/mlx5/Kconfig
@@ -1,6 +1,7 @@
 config MLX5_INFINIBAND
 	tristate "Mellanox Connect-IB HCA support"
 	depends on NETDEVICES && ETHERNET && PCI && MLX5_CORE
+	select INFINIBAND_USER_ACCESS
 	---help---
 	  This driver provides low-level InfiniBand support for
 	  Mellanox Connect-IB PCI Express host channel adapters (HCAs).