drm/amdgpu: replace DRM_ERROR with DRM_WARN in ras_reserve_bad_pages

There are two cases of reserve error should be ignored:
1) a ras bad page has been allocated (used by someone);
2) a ras bad page has been reserved (duplicate error injection for one page);

DRM_ERROR is unnecessary for the failure of bad page reserve
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -1411,10 +1411,15 @@ int amdgpu_ras_reserve_bad_pages(struct amdgpu_device *adev)
 	for (i = data->last_reserved; i < data->count; i++) {
 		bp = data->bps[i].retired_page;
 
+		/* There are two cases of reserve error should be ignored:
+		 * 1) a ras bad page has been allocated (used by someone);
+		 * 2) a ras bad page has been reserved (duplicate error injection
+		 *    for one page);
+		 */
 		if (amdgpu_bo_create_kernel_at(adev, bp << PAGE_SHIFT, PAGE_SIZE,
 					       AMDGPU_GEM_DOMAIN_VRAM,
 					       &bo, NULL))
-			DRM_ERROR("RAS ERROR: reserve vram %llx fail\n", bp);
+			DRM_WARN("RAS WARN: reserve vram for retired page %llx fail\n", bp);
 
 		data->bps_bo[i] = bo;
 		data->last_reserved = i + 1;