Re: [PATCH 4/7] drm/client: Deprecate struct drm_client_buffer.gem

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

Hi Thomas,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.18-rc2 next-20251024]
[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/Thomas-Zimmermann/drm-client-Remove-pitch-from-struct-drm_client_buffer/20251020-231709
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20251020151402.53013-5-tzimmermann%40suse.de
patch subject: [PATCH 4/7] drm/client: Deprecate struct drm_client_buffer.gem
config: arm-multi_v5_defconfig (https://download.01.org/0day-ci/archive/20251026/202510261717.a4f1joxt-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251026/202510261717.a4f1joxt-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/202510261717.a4f1joxt-lkp@intel.com/

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_buffer_vmap_local':
>> drivers/gpu/drm/drm_client.c:278:(.text+0x214): undefined reference to `drm_gem_fb_get_obj'
   arm-linux-gnueabi-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_buffer_vunmap_local':
   drivers/gpu/drm/drm_client.c:307:(.text+0x280): undefined reference to `drm_gem_fb_get_obj'
   arm-linux-gnueabi-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_buffer_vmap':
   drivers/gpu/drm/drm_client.c:338:(.text+0x2b4): undefined reference to `drm_gem_fb_get_obj'
   arm-linux-gnueabi-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_buffer_vunmap':
   drivers/gpu/drm/drm_client.c:360:(.text+0x2ec): undefined reference to `drm_gem_fb_get_obj'
   arm-linux-gnueabi-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_buffer_delete':
   drivers/gpu/drm/drm_client.c:178:(.text+0x6ec): undefined reference to `drm_gem_fb_get_obj'


vim +278 drivers/gpu/drm/drm_client.c

   254	
   255	/**
   256	 * drm_client_buffer_vmap_local - Map DRM client buffer into address space
   257	 * @buffer: DRM client buffer
   258	 * @map_copy: Returns the mapped memory's address
   259	 *
   260	 * This function maps a client buffer into kernel address space. If the
   261	 * buffer is already mapped, it returns the existing mapping's address.
   262	 *
   263	 * Client buffer mappings are not ref'counted. Each call to
   264	 * drm_client_buffer_vmap_local() should be closely followed by a call to
   265	 * drm_client_buffer_vunmap_local(). See drm_client_buffer_vmap() for
   266	 * long-term mappings.
   267	 *
   268	 * The returned address is a copy of the internal value. In contrast to
   269	 * other vmap interfaces, you don't need it for the client's vunmap
   270	 * function. So you can modify it at will during blit and draw operations.
   271	 *
   272	 * Returns:
   273	 *	0 on success, or a negative errno code otherwise.
   274	 */
   275	int drm_client_buffer_vmap_local(struct drm_client_buffer *buffer,
   276					 struct iosys_map *map_copy)
   277	{
 > 278		struct drm_gem_object *gem = drm_gem_fb_get_obj(buffer->fb, 0);
   279		struct iosys_map *map = &buffer->map;
   280		int ret;
   281	
   282		drm_gem_lock(gem);
   283	
   284		ret = drm_gem_vmap_locked(gem, map);
   285		if (ret)
   286			goto err_drm_gem_vmap_unlocked;
   287		*map_copy = *map;
   288	
   289		return 0;
   290	
   291	err_drm_gem_vmap_unlocked:
   292		drm_gem_unlock(gem);
   293		return ret;
   294	}
   295	EXPORT_SYMBOL(drm_client_buffer_vmap_local);
   296	

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