[drm-misc:for-linux-next 5/10] drivers/gpu/drm/drm_file.c:967 drm_show_memory_stats() error: uninitialized symbol 'supported_status'.

[Dan Carpenter]

tree:   git://anongit.freedesktop.org/drm/drm-misc for-linux-next
head:   dd9e329af7236e34c566d3705ea32a63069b9b13
commit: 686b21b5f6ca2f8a716f9a4ade07246dbfb2713e [5/10] drm: Add fdinfo memory stats
config: x86_64-randconfig-m001-20230524
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Reported-by: Dan Carpenter <error27 at gmail.com>
| Closes: https://lore.kernel.org/r/202305260440.7dv6FZHq-lkp@intel.com/

smatch warnings:
drivers/gpu/drm/drm_file.c:967 drm_show_memory_stats() error: uninitialized symbol 'supported_status'.

vim +/supported_status +967 drivers/gpu/drm/drm_file.c

686b21b5f6ca2f Rob Clark 2023-05-24  923  void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)
686b21b5f6ca2f Rob Clark 2023-05-24  924  {
686b21b5f6ca2f Rob Clark 2023-05-24  925  	struct drm_gem_object *obj;
686b21b5f6ca2f Rob Clark 2023-05-24  926  	struct drm_memory_stats status = {};
686b21b5f6ca2f Rob Clark 2023-05-24  927  	enum drm_gem_object_status supported_status;
686b21b5f6ca2f Rob Clark 2023-05-24  928  	int id;
686b21b5f6ca2f Rob Clark 2023-05-24  929  
686b21b5f6ca2f Rob Clark 2023-05-24  930  	spin_lock(&file->table_lock);
686b21b5f6ca2f Rob Clark 2023-05-24  931  	idr_for_each_entry (&file->object_idr, obj, id) {
686b21b5f6ca2f Rob Clark 2023-05-24  932  		enum drm_gem_object_status s = 0;
686b21b5f6ca2f Rob Clark 2023-05-24  933  
686b21b5f6ca2f Rob Clark 2023-05-24  934  		if (obj->funcs && obj->funcs->status) {
686b21b5f6ca2f Rob Clark 2023-05-24  935  			s = obj->funcs->status(obj);
686b21b5f6ca2f Rob Clark 2023-05-24  936  			supported_status = DRM_GEM_OBJECT_RESIDENT |
686b21b5f6ca2f Rob Clark 2023-05-24  937  					DRM_GEM_OBJECT_PURGEABLE;

Smatch is concerned that we might not hit this assignment.  That seems
reasonable, because otherwise why not hard code it at the start?

686b21b5f6ca2f Rob Clark 2023-05-24  938  		}
686b21b5f6ca2f Rob Clark 2023-05-24  939  
686b21b5f6ca2f Rob Clark 2023-05-24  940  		if (obj->handle_count > 1) {
686b21b5f6ca2f Rob Clark 2023-05-24  941  			status.shared += obj->size;
686b21b5f6ca2f Rob Clark 2023-05-24  942  		} else {
686b21b5f6ca2f Rob Clark 2023-05-24  943  			status.private += obj->size;
686b21b5f6ca2f Rob Clark 2023-05-24  944  		}
686b21b5f6ca2f Rob Clark 2023-05-24  945  
686b21b5f6ca2f Rob Clark 2023-05-24  946  		if (s & DRM_GEM_OBJECT_RESIDENT) {
686b21b5f6ca2f Rob Clark 2023-05-24  947  			status.resident += obj->size;
686b21b5f6ca2f Rob Clark 2023-05-24  948  		} else {
686b21b5f6ca2f Rob Clark 2023-05-24  949  			/* If already purged or not yet backed by pages, don't
686b21b5f6ca2f Rob Clark 2023-05-24  950  			 * count it as purgeable:
686b21b5f6ca2f Rob Clark 2023-05-24  951  			 */
686b21b5f6ca2f Rob Clark 2023-05-24  952  			s &= ~DRM_GEM_OBJECT_PURGEABLE;
686b21b5f6ca2f Rob Clark 2023-05-24  953  		}
686b21b5f6ca2f Rob Clark 2023-05-24  954  
686b21b5f6ca2f Rob Clark 2023-05-24  955  		if (!dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true))) {
686b21b5f6ca2f Rob Clark 2023-05-24  956  			status.active += obj->size;
686b21b5f6ca2f Rob Clark 2023-05-24  957  
686b21b5f6ca2f Rob Clark 2023-05-24  958  			/* If still active, don't count as purgeable: */
686b21b5f6ca2f Rob Clark 2023-05-24  959  			s &= ~DRM_GEM_OBJECT_PURGEABLE;
686b21b5f6ca2f Rob Clark 2023-05-24  960  		}
686b21b5f6ca2f Rob Clark 2023-05-24  961  
686b21b5f6ca2f Rob Clark 2023-05-24  962  		if (s & DRM_GEM_OBJECT_PURGEABLE)
686b21b5f6ca2f Rob Clark 2023-05-24  963  			status.purgeable += obj->size;
686b21b5f6ca2f Rob Clark 2023-05-24  964  	}
686b21b5f6ca2f Rob Clark 2023-05-24  965  	spin_unlock(&file->table_lock);
686b21b5f6ca2f Rob Clark 2023-05-24  966  
686b21b5f6ca2f Rob Clark 2023-05-24 @967  	drm_print_memory_stats(p, &status, supported_status, "memory");
686b21b5f6ca2f Rob Clark 2023-05-24  968  }

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