ERROR: modpost: "vmf_insert_pfn" [drivers/gpu/drm/drm_shmem_helper.ko] undefined!

ERROR: modpost: "vmf_insert_pfn" [drivers/gpu/drm/drm_shmem_helper.ko] undefined!

[kernel test robot]

Hi LiangCheng,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa
commit: 0c4932f6ddf815618fa34f7403df682aed7862b5 drm/tiny: pixpaper: Fix missing dependency on DRM_GEM_SHMEM_HELPER
date:   5 weeks ago
config: riscv-randconfig-r072-20251027 (https://download.01.org/0day-ci/archive/20251028/202510280213.0rlYA4T3-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251028/202510280213.0rlYA4T3-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510280213.0rlYA4T3-lkp@intel.com/

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

>> ERROR: modpost: "vmf_insert_pfn" [drivers/gpu/drm/drm_shmem_helper.ko] undefined!

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for DRM_GEM_SHMEM_HELPER
   Depends on [n]: HAS_IOMEM [=y] && DRM [=y] && MMU [=n]
   Selected by [m]:
   - DRM_PIXPAPER [=m] && HAS_IOMEM [=y] && DRM [=y] && SPI [=y]

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki