diff -r 014ac7a32048 -r 28899b6f4480 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Jan 13 23:41:37 2021 +0100
+++ b/mercurial/localrepo.py	Wed Jan 13 23:50:03 2021 +0100
@@ -1081,8 +1081,6 @@
         options[b'persistent-nodemap'] = True
     if ui.configbool(b'storage', b'revlog.persistent-nodemap.mmap'):
         options[b'persistent-nodemap.mmap'] = True
-    epnm = ui.config(b'storage', b'revlog.nodemap.mode')
-    options[b'persistent-nodemap.mode'] = epnm
     if ui.configbool(b'devel', b'persistent-nodemap'):
         options[b'devel-force-nodemap'] = True