* [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
@ 2025-12-09 15:58 kernel test robot
2025-12-09 16:37 ` Boris Brezillon
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2025-12-09 15:58 UTC (permalink / raw)
To: Loïc Molinari; +Cc: llvm, oe-kbuild-all, dri-devel, Boris Brezillon
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
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [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
2025-12-09 15:58 [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
@ 2025-12-09 16:37 ` Boris Brezillon
0 siblings, 0 replies; 2+ messages in thread
From: Boris Brezillon @ 2025-12-09 16:37 UTC (permalink / raw)
To: kernel test robot
Cc: Loïc Molinari, llvm, oe-kbuild-all, dri-devel,
Boris Brezillon
On Tue, 9 Dec 2025 23:58:10 +0800
kernel test robot <lkp@intel.com> wrote:
> 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);
Hm, smells like a build without CONFIG_MMU=n. I guess we need some
#ifdef CONFIG_MMU around drm_gem_get_unmapped_area() definitions.
> 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
>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2025-12-09 16:37 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-12-09 15:58 [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
2025-12-09 16:37 ` Boris Brezillon
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox