Index: sys/dev/drm2/ttm/ttm_bo_vm.c
===================================================================
--- sys/dev/drm2/ttm/ttm_bo_vm.c
+++ sys/dev/drm2/ttm/ttm_bo_vm.c
@@ -104,7 +104,7 @@
 	struct ttm_buffer_object *bo = vm_obj->handle;
 	struct ttm_bo_device *bdev = bo->bdev;
 	struct ttm_tt *ttm = NULL;
-	vm_page_t m, m1;
+	vm_page_t m;
 	int ret;
 	int retval = VM_PAGER_OK;
 	struct ttm_mem_type_manager *man =
@@ -234,22 +234,14 @@
 		ttm_bo_unreserve(bo);
 		goto retry;
 	}
-	m1 = vm_page_lookup(vm_obj, OFF_TO_IDX(offset));
-	/* XXX This looks like it should just be vm_page_replace? */
-	if (m1 == NULL) {
-		if (vm_page_insert(m, vm_obj, OFF_TO_IDX(offset))) {
-			vm_page_xunbusy(m);
-			VM_OBJECT_WUNLOCK(vm_obj);
-			vm_wait(vm_obj);
-			VM_OBJECT_WLOCK(vm_obj);
-			ttm_mem_io_unlock(man);
-			ttm_bo_unreserve(bo);
-			goto retry;
-		}
-	} else {
-		KASSERT(m == m1,
-		    ("inconsistent insert bo %p m %p m1 %p offset %jx",
-		    bo, m, m1, (uintmax_t)offset));
+	if (vm_page_insert(m, vm_obj, OFF_TO_IDX(offset)) == ENOMEM) {
+		vm_page_xunbusy(m);
+		VM_OBJECT_WUNLOCK(vm_obj);
+		vm_wait(vm_obj);
+		VM_OBJECT_WLOCK(vm_obj);
+		ttm_mem_io_unlock(man);
+		ttm_bo_unreserve(bo);
+		goto retry;
 	}
 	vm_page_valid(m);
 	if (*mres != NULL) {
Index: sys/vm/vm_radix.h
===================================================================
--- sys/vm/vm_radix.h
+++ sys/vm/vm_radix.h
@@ -80,13 +80,7 @@
 vm_radix_insert_lookup_lt(struct vm_radix *rtree, vm_page_t page,
     vm_page_t *mpred)
 {
-	int error;
-
-	error = VM_RADIX_PCTRIE_INSERT_LOOKUP_LE(&rtree->rt_trie, page, mpred);
-	if (__predict_false(error == EEXIST))
-		panic("vm_radix_insert_lookup_lt: page already present, %p",
-		    *mpred);
-	return (error);
+	return (VM_RADIX_PCTRIE_INSERT_LOOKUP_LE(&rtree->rt_trie, page, mpred));
 }
 
 /*