[PATCH v3 3/4] drm/ttm, drm/amdgpu, drm/xe: Consider hitch moves within bulk sublist moves

[kernel test robot]

Hi Thomas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm-intel/for-linux-next drm-tip/drm-tip]
[cannot apply to drm-intel/for-linux-next-fixes linus/master v6.8-rc7 next-20240305]
[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-Hellstr-m/drm-ttm-Allow-TTM-LRU-list-nodes-of-different-types/20240306-000453
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240305160202.3555-4-thomas.hellstrom%40linux.intel.com
patch subject: [PATCH v3 3/4] drm/ttm, drm/amdgpu, drm/xe: Consider hitch moves within bulk sublist moves
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240306/202403060640.zCXpVObi-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240306/202403060640.zCXpVObi-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403060640.zCXpVObi-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_gem_ttm_helper.c:5:
   In file included from include/drm/drm_gem_ttm_helper.h:10:
   In file included from include/drm/ttm/ttm_bo.h:39:
>> include/drm/ttm/ttm_device.h:286:31: warning: variable 'old' set but not used [-Wunused-but-set-variable]
           struct ttm_resource_manager *old;
                                        ^
   1 warning generated.


vim +/old +286 include/drm/ttm/ttm_device.h

   282	
   283	static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
   284						  struct ttm_resource_manager *manager)
   285	{
 > 286		struct ttm_resource_manager *old;
   287	
   288		BUILD_BUG_ON(__builtin_constant_p(type) && type >= TTM_NUM_MEM_TYPES);
   289		old = bdev->man_drv[type];
   290		bdev->man_drv[type] = manager;
   291		if (manager)
   292			manager->mem_type = type;
   293	}
   294	

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