drm: Change create block to reserve node

With the previous patch we no longer actually create a node, we simply
find the correct hole and occupy it. This very well could have been
squashed with the last patch, but since I already had David's review, I
figured it's easiest to keep it distinct.

Also update the users in i915. Conveniently this is the only user of the
interface.

CC: David Airlie <airlied@linux.ie>
CC: <dri-devel@lists.freedesktop.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Acked-by: David Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 2746ff2..4e6dbbb 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -349,8 +349,9 @@
 	if (!stolen)
 		return NULL;
 
-	ret = drm_mm_create_block(&dev_priv->mm.stolen, stolen, stolen_offset,
-				  size);
+	stolen->start = stolen_offset;
+	stolen->size = size;
+	ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 	if (ret) {
 		DRM_DEBUG_KMS("failed to allocate stolen space\n");
 		kfree(stolen);
@@ -380,9 +381,10 @@
 			goto unref_out;
 		}
 
-		ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
-					  obj->gtt_space,
-					  gtt_offset, size);
+		obj->gtt_space->start = gtt_offset;
+		obj->gtt_space->size = size;
+		ret = drm_mm_reserve_node(&dev_priv->mm.gtt_space,
+					  obj->gtt_space);
 		if (ret) {
 			DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 			goto free_out;