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Thanks for the patch. Since you modified PyCFunction_GET_SELF to return NULL for static methods, why not simply use it instead of manually looking up the flags in several places?
I'm talking about the following changes:
- PyObject *self = PyCFunction_GET_SELF(func);
+ int flags = PyCFunction_GET_FLAGS(func);
+ PyObject *self = flags & METH_STATIC ? NULL :
+ _PyCFunction_GET_RAW_SELF(func);
[...]
 self = m->m_self;
- if (self == NULL)
+ if (self == NULL || PyCFunction_GET_FLAGS(m) & METH_STATIC)
 self = Py_None;
[...]
- PyObject *self = PyCFunction_GET_SELF(func);
+ PyObject *self = flags & METH_STATIC ? NULL :
+ _PyCFunction_GET_RAW_SELF(func);
Unless you demonstrate there's a significant performance improvement in this style, we should really favour the simpler style.