[PATCH] dma-buf: fix build due to missing export

[kernel test robot]

Hi Lucas,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-drm-misc/for-linux-next]
[cannot apply to tegra-drm/drm/tegra/for-next linus/master v5.13-rc4 next-20210604]
[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]

url:    https://github.com/0day-ci/linux/commits/Lucas-De-Marchi/dma-buf-fix-build-due-to-missing-export/20210605-082109
base:   git://anongit.freedesktop.org/drm/drm-misc for-linux-next
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/c3c64fb8ca0e44b7fee87ed5cc623f2b2a8fa2c6
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Lucas-De-Marchi/dma-buf-fix-build-due-to-missing-export/20210605-082109
        git checkout c3c64fb8ca0e44b7fee87ed5cc623f2b2a8fa2c6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "__aeabi_ldivmod" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
>> ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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