From: Arnd Bergmann <arnd@arndb.de>

The addition of dmabuf support in uverbs means that it is no
longer possible to build infiniband support if that is disabled:

arm-linux-gnueabi-ld: drivers/infiniband/core/ib_core_uverbs.o: in function `rdma_user_mmap_entry_remove.part.0':
ib_core_uverbs.c:(.text+0x508): undefined reference to `dma_buf_move_notify'
(dma_buf_move_notify): Unknown destination type (ARM/Thumb) in drivers/infiniband/core/ib_core_uverbs.o
ib_core_uverbs.c:(.text+0x518): undefined reference to `dma_resv_wait_timeout'
(dma_resv_wait_timeout): Unknown destination type (ARM/Thumb) in drivers/infiniband/core/ib_core_uverbs.o

Select this from Kconfig, as we do for the other users.

Fixes: 0ac6f4056c4a ("RDMA/uverbs: Add DMABUF object type and operations")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/infiniband/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index 794b9778816b..78ac2ff5befd 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -6,6 +6,7 @@ menuconfig INFINIBAND
 	depends on INET
 	depends on m || IPV6 != m
 	depends on !ALPHA
+	select DMA_SHARED_BUFFER
 	select IRQ_POLL
 	select DIMLIB
 	help
-- 
2.39.5

On Mon, 16 Feb 2026 13:12:00 +0100, Arnd Bergmann wrote:
> The addition of dmabuf support in uverbs means that it is no
> longer possible to build infiniband support if that is disabled:
> 
> arm-linux-gnueabi-ld: drivers/infiniband/core/ib_core_uverbs.o: in function `rdma_user_mmap_entry_remove.part.0':
> ib_core_uverbs.c:(.text+0x508): undefined reference to `dma_buf_move_notify'
> (dma_buf_move_notify): Unknown destination type (ARM/Thumb) in drivers/infiniband/core/ib_core_uverbs.o
> ib_core_uverbs.c:(.text+0x518): undefined reference to `dma_resv_wait_timeout'
> (dma_resv_wait_timeout): Unknown destination type (ARM/Thumb) in drivers/infiniband/core/ib_core_uverbs.o
> 
> [...]

Applied, thanks!

[1/1] RDMA/uverbs: select CONFIG_DMA_SHARED_BUFFER
      https://git.kernel.org/rdma/rdma/c/16cb1a64dce567

Best regards,
-- 
Leon Romanovsky <leon@kernel.org>

On Mon, Feb 16, 2026 at 01:12:00PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The addition of dmabuf support in uverbs means that it is no
> longer possible to build infiniband support if that is disabled:
> 
> arm-linux-gnueabi-ld: drivers/infiniband/core/ib_core_uverbs.o: in function `rdma_user_mmap_entry_remove.part.0':
> ib_core_uverbs.c:(.text+0x508): undefined reference to `dma_buf_move_notify'
> (dma_buf_move_notify): Unknown destination type (ARM/Thumb) in drivers/infiniband/core/ib_core_uverbs.o
> ib_core_uverbs.c:(.text+0x518): undefined reference to `dma_resv_wait_timeout'
> (dma_resv_wait_timeout): Unknown destination type (ARM/Thumb) in drivers/infiniband/core/ib_core_uverbs.o
> 
> Select this from Kconfig, as we do for the other users.
> 
> Fixes: 0ac6f4056c4a ("RDMA/uverbs: Add DMABUF object type and operations")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/infiniband/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 

It looks reasonable to me. dma-buf is becoming a first‑class citizen in the
RDMA world.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>