commit 581b4faa6c9786617f50158ca031d2494d358f51
Author: Victor Stinner <vstinner@python.org>
Date:   Wed Jan 26 00:54:40 2022 +0100

    bpo-45476: Add PyDescr_New() function
    
    Add new PyDescr_New() function to create a descriptor object.
    
    Add Include/cpython/descrobject.h header file: move C API excluded
    from the limited C API there.

diff --git a/Doc/c-api/descriptor.rst b/Doc/c-api/descriptor.rst
index b32c113e5f..08f9f025c9 100644
--- a/Doc/c-api/descriptor.rst
+++ b/Doc/c-api/descriptor.rst
@@ -15,6 +15,15 @@ found in the dictionary of type objects.
    The type object for the built-in descriptor types.
 
 
+.. c:function:: PyObject* PyDescr_New(PyTypeObject *desc_type, PyTypeObject *type, const char *name)
+
+   Create a descriptor object.
+
+   *descr_type*, *type* and *name* must not be ``NULL``.
+
+   .. versionadded:: 3.11
+
+
 .. c:function:: PyObject* PyDescr_NewGetSet(PyTypeObject *type, struct PyGetSetDef *getset)
 
 
diff --git a/Doc/whatsnew/3.11.rst b/Doc/whatsnew/3.11.rst
index 4328ee6a50..53d6a0c7d7 100644
--- a/Doc/whatsnew/3.11.rst
+++ b/Doc/whatsnew/3.11.rst
@@ -677,6 +677,9 @@ New Features
   :c:macro:`PY_VERSION_HEX`.
   (Contributed by  Gabriele N. Tornetta in :issue:`43931`.)
 
+* Add new :c:func:`PyDescr_New` function to create a descriptor object.
+  (Contributed by Victor Stinner in :issue:`45476`.)
+
 
 Porting to Python 3.11
 ----------------------
diff --git a/Misc/NEWS.d/next/C API/2022-01-26-00-59-53.bpo-45476.xqT1YV.rst b/Misc/NEWS.d/next/C API/2022-01-26-00-59-53.bpo-45476.xqT1YV.rst
new file mode 100644
index 0000000000..d30a5c8f79
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2022-01-26-00-59-53.bpo-45476.xqT1YV.rst	
@@ -0,0 +1 @@
+Add new :c:func:`PyDescr_New` function to create a descriptor object.
diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index 962136beae..8910e40bc3 100644
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -876,24 +876,30 @@ PyTypeObject PyWrapperDescr_Type = {
     0,                                          /* tp_descr_set */
 };
 
-static PyDescrObject *
-descr_new(PyTypeObject *descrtype, PyTypeObject *type, const char *name)
+PyDescrObject *
+PyDescr_New(PyTypeObject *descr_type, PyTypeObject *type, const char *name)
 {
-    PyDescrObject *descr;
+    assert(descr_type != NULL);
+    assert(type != NULL);
+    assert(name != NULL);
+    assert(_PyType_IS_GC(descr_type));
 
-    descr = (PyDescrObject *)PyType_GenericAlloc(descrtype, 0);
-    if (descr != NULL) {
-        Py_XINCREF(type);
-        descr->d_type = type;
-        descr->d_name = PyUnicode_InternFromString(name);
-        if (descr->d_name == NULL) {
-            Py_DECREF(descr);
-            descr = NULL;
-        }
-        else {
-            descr->d_qualname = NULL;
-        }
+    PyObject *name_obj = PyUnicode_InternFromString(name);
+    if (name_obj == NULL) {
+        return NULL;
     }
+
+    PyDescrObject *descr = (PyDescrObject *)_PyType_AllocNoTrack(descr_type, 0);
+    if (descr == NULL) {
+        Py_DECREF(name_obj);
+        return NULL;
+    }
+
+    descr->d_type = (PyTypeObject*)Py_NewRef(type);
+    descr->d_name = name_obj;
+    descr->d_qualname = NULL;
+    _PyObject_GC_TRACK(descr);
+
     return descr;
 }
 
@@ -934,8 +940,8 @@ PyDescr_NewMethod(PyTypeObject *type, PyMethodDef *method)
 
     PyMethodDescrObject *descr;
 
-    descr = (PyMethodDescrObject *)descr_new(&PyMethodDescr_Type,
-                                             type, method->ml_name);
+    descr = (PyMethodDescrObject *)PyDescr_New(&PyMethodDescr_Type,
+                                               type, method->ml_name);
     if (descr != NULL) {
         descr->d_method = method;
         descr->vectorcall = vectorcall;
@@ -948,8 +954,8 @@ PyDescr_NewClassMethod(PyTypeObject *type, PyMethodDef *method)
 {
     PyMethodDescrObject *descr;
 
-    descr = (PyMethodDescrObject *)descr_new(&PyClassMethodDescr_Type,
-                                             type, method->ml_name);
+    descr = (PyMethodDescrObject *)PyDescr_New(&PyClassMethodDescr_Type,
+                                               type, method->ml_name);
     if (descr != NULL)
         descr->d_method = method;
     return (PyObject *)descr;
@@ -960,8 +966,8 @@ PyDescr_NewMember(PyTypeObject *type, PyMemberDef *member)
 {
     PyMemberDescrObject *descr;
 
-    descr = (PyMemberDescrObject *)descr_new(&PyMemberDescr_Type,
-                                             type, member->name);
+    descr = (PyMemberDescrObject *)PyDescr_New(&PyMemberDescr_Type,
+                                               type, member->name);
     if (descr != NULL)
         descr->d_member = member;
     return (PyObject *)descr;
@@ -972,8 +978,8 @@ PyDescr_NewGetSet(PyTypeObject *type, PyGetSetDef *getset)
 {
     PyGetSetDescrObject *descr;
 
-    descr = (PyGetSetDescrObject *)descr_new(&PyGetSetDescr_Type,
-                                             type, getset->name);
+    descr = (PyGetSetDescrObject *)PyDescr_New(&PyGetSetDescr_Type,
+                                               type, getset->name);
     if (descr != NULL)
         descr->d_getset = getset;
     return (PyObject *)descr;
@@ -984,8 +990,8 @@ PyDescr_NewWrapper(PyTypeObject *type, struct wrapperbase *base, void *wrapped)
 {
     PyWrapperDescrObject *descr;
 
-    descr = (PyWrapperDescrObject *)descr_new(&PyWrapperDescr_Type,
-                                             type, base->name);
+    descr = (PyWrapperDescrObject *)PyDescr_New(&PyWrapperDescr_Type,
+                                                type, base->name);
     if (descr != NULL) {
         descr->d_base = base;
         descr->d_wrapped = wrapped;