commit de4ae3d4869e88dda8bfbad24880cb398160a7a0
author Victor Stinner <victor.stinner@gmail.com> Sun Dec 04 22:59:09 2016 +0100
committer Victor Stinner <victor.stinner@gmail.com> Sun Dec 04 22:59:09 2016 +0100
tree b8c42842a31f408c9fe09993e19fba49d60b2dcf
parent c8d03187ff85326ab8b24af06f8a4e391365f42a

Backed out changeset b9c9691c72c5

Issue #28858: The change b9c9691c72c5 introduced a regression. It seems like
_PyObject_CallArg1() uses more stack memory than
PyObject_CallFunctionObjArgs().

Objects/memoryobject.c

diff --git a/Objects/memoryobject.c b/Objects/memoryobject.c
index eac07fb..428d83c 100644
--- a/Objects/memoryobject.c
+++ b/Objects/memoryobject.c
@@ -1939,7 +1939,7 @@
     if (format == NULL)
         goto error;
 
-    structobj = _PyObject_CallArg1(Struct, format);
+    structobj = PyObject_CallFunctionObjArgs(Struct, format, NULL);
     if (structobj == NULL)
         goto error;
 
@@ -1978,7 +1978,7 @@
     PyObject *v;
 
     memcpy(x->item, ptr, x->itemsize);
-    v = _PyObject_CallArg1(x->unpack_from, x->mview);
+    v = PyObject_CallFunctionObjArgs(x->unpack_from, x->mview, NULL);
     if (v == NULL)
         return NULL;