[PATCH v8 3/6] iio: core: Add new DMABUF interface infrastructure

[kernel test robot]

Hi Paul,

kernel test robot noticed the following build errors:

[auto build test ERROR on jic23-iio/togreg]
[also build test ERROR on vkoul-dmaengine/next lwn/docs-next linus/master v6.8-rc7 next-20240308]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Paul-Cercueil/dmaengine-Add-API-function-dmaengine_prep_peripheral_dma_vec/20240309-010421
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20240308170046.92899-4-paul%40crapouillou.net
patch subject: [PATCH v8 3/6] iio: core: Add new DMABUF interface infrastructure
config: um-randconfig-002-20240310 (https://download.01.org/0day-ci/archive/20240310/202403101928.WWSQwfdG-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240310/202403101928.WWSQwfdG-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403101928.WWSQwfdG-lkp@intel.com/

All errors (new ones prefixed by >>):

   /usr/bin/ld: drivers/iio/industrialio-buffer.o: in function `iio_buffer_dmabuf_release':
>> industrialio-buffer.c:(.text+0xec6): undefined reference to `dma_buf_unmap_attachment'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xf96): undefined reference to `dma_buf_detach'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xfa5): undefined reference to `dma_buf_put'
   /usr/bin/ld: drivers/iio/industrialio-buffer.o: in function `iio_buffer_signal_dmabuf_done':
>> industrialio-buffer.c:(.text+0x4a56): undefined reference to `dma_fence_signal'
   /usr/bin/ld: drivers/iio/industrialio-buffer.o: in function `iio_buffer_cleanup':
>> industrialio-buffer.c:(.text+0x64f2): undefined reference to `dma_fence_release'
   /usr/bin/ld: drivers/iio/industrialio-buffer.o: in function `iio_buffer_attach_dmabuf.isra.0':
>> industrialio-buffer.c:(.text+0x9dbf): undefined reference to `dma_fence_context_alloc'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0x9df7): undefined reference to `dma_buf_get'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0x9e38): undefined reference to `dma_buf_attach'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0x9efe): undefined reference to `dma_buf_map_attachment'
   /usr/bin/ld: industrialio-buffer.c:(.text+0xa2c1): undefined reference to `dma_buf_detach'
   /usr/bin/ld: industrialio-buffer.c:(.text+0xa2cd): undefined reference to `dma_buf_put'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xa34d): undefined reference to `dma_buf_unmap_attachment'
   /usr/bin/ld: drivers/iio/industrialio-buffer.o: in function `iio_buffer_enqueue_dmabuf':
>> industrialio-buffer.c:(.text+0xa949): undefined reference to `dma_buf_get'
   /usr/bin/ld: industrialio-buffer.c:(.text+0xa997): undefined reference to `dma_buf_put'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xac84): undefined reference to `dma_fence_init'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xad4b): undefined reference to `dma_resv_wait_timeout'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xadec): undefined reference to `dma_resv_reserve_fences'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xae2c): undefined reference to `dma_resv_add_fence'
>> /usr/bin/ld: industrialio-buffer.c:(.text+0xb0da): undefined reference to `dma_fence_release'
   /usr/bin/ld: drivers/iio/industrialio-buffer.o: in function `iio_buffer_chrdev_ioctl':
   industrialio-buffer.c:(.text+0xb833): undefined reference to `dma_buf_get'
   /usr/bin/ld: industrialio-buffer.c:(.text+0xbad0): undefined reference to `dma_buf_put'
   collect2: error: ld returned 1 exit status

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