drm/nouveau: initial changes to support multiple VMAs per buffer object

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_vm.h b/drivers/gpu/drm/nouveau/nouveau_vm.h
index c48a9fc..07d07ff 100644
--- a/drivers/gpu/drm/nouveau/nouveau_vm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_vm.h
@@ -41,6 +41,7 @@
 };
 
 struct nouveau_vma {
+	struct list_head head;
 	struct nouveau_vm *vm;
 	struct nouveau_mm_node *node;
 	u64 offset;