[Intel-gfx] [PATCH] drm/ttm: replace busy placement with flags v2

[kernel test robot]

Hi Somalapuram,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-tip/drm-tip]

url:    https://github.com/intel-lab-lkp/linux/commits/Somalapuram-Amaranath/drm-ttm-replace-busy-placement-with-flags-v2/20231109-104055
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
patch link:    https://lore.kernel.org/r/20231109023843.32326-1-Amaranath.Somalapuram%40amd.com
patch subject: [Intel-gfx] [PATCH] drm/ttm: replace busy placement with flags v2
config: i386-buildonly-randconfig-001-20231109 (https://download.01.org/0day-ci/archive/20231109/202311091846.P6fN32iP-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231109/202311091846.P6fN32iP-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/202311091846.P6fN32iP-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In function 'i915_ttm_placement_from_obj',
       inlined from 'i915_ttm_get_pages' at drivers/gpu/drm/i915/gem/i915_gem_ttm.c:847:2:
>> drivers/gpu/drm/i915/gem/i915_gem_ttm.c:165:18: warning: 'places[0].flags' is used uninitialized [-Wuninitialized]
     165 |         places[0].flags |= TTM_PL_FLAG_IDLE;
         |         ~~~~~~~~~^~~~~~
   drivers/gpu/drm/i915/gem/i915_gem_ttm.c: In function 'i915_ttm_get_pages':
   drivers/gpu/drm/i915/gem/i915_gem_ttm.c:837:26: note: 'places' declared here
     837 |         struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];
         |                          ^~~~~~


vim +165 drivers/gpu/drm/i915/gem/i915_gem_ttm.c

   155	
   156	static void
   157	i915_ttm_placement_from_obj(const struct drm_i915_gem_object *obj,
   158				    struct ttm_place *places,
   159				    struct ttm_placement *placement)
   160	{
   161		unsigned int num_allowed = obj->mm.n_placements;
   162		unsigned int flags = obj->flags;
   163		unsigned int i;
   164	
 > 165		places[0].flags |= TTM_PL_FLAG_IDLE;
   166		i915_ttm_place_from_region(num_allowed ? obj->mm.placements[0] :
   167					   obj->mm.region, &places[0], obj->bo_offset,
   168					   obj->base.size, flags);
   169	
   170		/* Cache this on object? */
   171		for (i = 0; i < num_allowed; ++i) {
   172			i915_ttm_place_from_region(obj->mm.placements[i],
   173						   &places[i + 1], obj->bo_offset,
   174						   obj->base.size, flags);
   175			places[i + 1].flags |= TTM_PL_FLAG_BUSY;
   176		}
   177	
   178		placement->num_placement = num_allowed + 1;
   179		placement->placement = places;
   180	}
   181	

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