[drm-misc:drm-misc-next 4/11] drivers/gpu/drm/drm_gem.c:1261:10: error: call to undeclared function 'mm_get_unmapped_area'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

tree:   https://gitlab.freedesktop.org/drm/misc/kernel.git drm-misc-next
head:   0823bd894278e4c0f1acb8f3a8a3c67745e6d1f6
commit: 99bda20d6d4cac30ed6d357658d8bc328c3b27d9 [4/11] drm/gem: Introduce drm_gem_get_unmapped_area() fop
config: arm-randconfig-003-20251209 (https://download.01.org/0day-ci/archive/20251209/202512092338.ylY8zET6-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 6ec8c4351cfc1d0627d1633b02ea787bd29c77d8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251209/202512092338.ylY8zET6-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/202512092338.ylY8zET6-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/drm_gem.c:1261:10: error: call to undeclared function 'mm_get_unmapped_area'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1261 |                 return mm_get_unmapped_area(current->mm, filp, uaddr, len, 0,
         |                        ^
   drivers/gpu/drm/drm_gem.c:1261:10: note: did you mean '__get_unmapped_area'?
   include/linux/mm.h:3441:1: note: '__get_unmapped_area' declared here
    3441 | __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
         | ^
   1 error generated.


vim +/mm_get_unmapped_area +1261 drivers/gpu/drm/drm_gem.c

  1229	
  1230	/**
  1231	 * drm_gem_get_unmapped_area - get memory mapping region routine for GEM objects
  1232	 * @filp: DRM file pointer
  1233	 * @uaddr: User address hint
  1234	 * @len: Mapping length
  1235	 * @pgoff: Offset (in pages)
  1236	 * @flags: Mapping flags
  1237	 *
  1238	 * If a driver supports GEM object mapping, before ending up in drm_gem_mmap(),
  1239	 * mmap calls on the DRM file descriptor will first try to find a free linear
  1240	 * address space large enough for a mapping. Since GEM objects are backed by
  1241	 * shmem buffers, this should preferably be handled by the shmem virtual memory
  1242	 * filesystem which can appropriately align addresses to huge page sizes when
  1243	 * needed.
  1244	 *
  1245	 * Look up the GEM object based on the offset passed in (vma->vm_pgoff will
  1246	 * contain the fake offset we created) and call shmem_get_unmapped_area() with
  1247	 * the right file pointer.
  1248	 *
  1249	 * If a GEM object is not available at the given offset or if the caller is not
  1250	 * granted access to it, fall back to mm_get_unmapped_area().
  1251	 */
  1252	unsigned long drm_gem_get_unmapped_area(struct file *filp, unsigned long uaddr,
  1253						unsigned long len, unsigned long pgoff,
  1254						unsigned long flags)
  1255	{
  1256		struct drm_gem_object *obj;
  1257		unsigned long ret;
  1258	
  1259		obj = drm_gem_object_lookup_at_offset(filp, pgoff, len >> PAGE_SHIFT);
  1260		if (IS_ERR(obj) || !obj->filp || !obj->filp->f_op->get_unmapped_area)
> 1261			return mm_get_unmapped_area(current->mm, filp, uaddr, len, 0,
  1262						    flags);
  1263	
  1264		ret = obj->filp->f_op->get_unmapped_area(obj->filp, uaddr, len, 0,
  1265							 flags);
  1266	
  1267		drm_gem_object_put(obj);
  1268	
  1269		return ret;
  1270	}
  1271	EXPORT_SYMBOL_GPL(drm_gem_get_unmapped_area);
  1272	

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