drm/ttm: use a helper for unlocked moves to the lru tail

The pattern was repeated a few times, just make an inline for it.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200804025632.3868079-7-airlied@gmail.com

drivers/gpu/drm/ttm/ttm_bo.c

@@ -1101,9 +1101,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 
 error:
 	if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
-		spin_lock(&ttm_bo_glob.lru_lock);
-		ttm_bo_move_to_lru_tail(bo, NULL);
-		spin_unlock(&ttm_bo_glob.lru_lock);
+		ttm_bo_move_to_lru_tail_unlocked(bo);
 	}
 
 	return ret;
@@ -1318,9 +1316,7 @@ int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
 		return ret;
 	}
 
-	spin_lock(&ttm_bo_glob.lru_lock);
-	ttm_bo_move_to_lru_tail(bo, NULL);
-	spin_unlock(&ttm_bo_glob.lru_lock);
+	ttm_bo_move_to_lru_tail_unlocked(bo);
 
 	return ret;
 }

drivers/gpu/drm/ttm/ttm_bo_vm.c

@@ -306,9 +306,7 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
 		}
 
 		if (bo->moving != moving) {
-			spin_lock(&ttm_bo_glob.lru_lock);
-			ttm_bo_move_to_lru_tail(bo, NULL);
-			spin_unlock(&ttm_bo_glob.lru_lock);
+			ttm_bo_move_to_lru_tail_unlocked(bo);
 		}
 		dma_fence_put(moving);
 	}

include/drm/ttm/ttm_bo_driver.h

@@ -669,6 +669,13 @@ static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 	return 0;
 }
 
+static inline void ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
+{
+	spin_lock(&ttm_bo_glob.lru_lock);
+	ttm_bo_move_to_lru_tail(bo, NULL);
+	spin_unlock(&ttm_bo_glob.lru_lock);
+}
+
 /**
  * ttm_bo_unreserve
  *
@@ -678,9 +685,7 @@ static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
  */
 static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 {
-	spin_lock(&ttm_bo_glob.lru_lock);
-	ttm_bo_move_to_lru_tail(bo, NULL);
-	spin_unlock(&ttm_bo_glob.lru_lock);
+	ttm_bo_move_to_lru_tail_unlocked(bo);
 	dma_resv_unlock(bo->base.resv);
 }