diff --git a/hgext/histedit.py b/hgext/histedit.py
--- a/hgext/histedit.py
+++ b/hgext/histedit.py
@@ -635,12 +635,11 @@
 
 def applychanges(ui, repo, ctx, opts):
     """Merge changeset from ctx (only) in the current working directory"""
-    wcpar = repo.dirstate.p1()
-    if ctx.p1().node() == wcpar:
+    if ctx.p1().node() == repo.dirstate.p1():
         # edits are "in place" we do not need to make any merge,
         # just applies changes on parent for editing
         ui.pushbuffer()
-        cmdutil.revert(ui, repo, ctx, (wcpar, node.nullid), all=True)
+        cmdutil.revert(ui, repo, ctx, all=True)
         stats = mergemod.updateresult(0, 0, 0, 0)
         ui.popbuffer()
     else:
diff --git a/hgext/largefiles/overrides.py b/hgext/largefiles/overrides.py
--- a/hgext/largefiles/overrides.py
+++ b/hgext/largefiles/overrides.py
@@ -874,7 +874,7 @@
 # the matcher to hit standins instead of largefiles. Based on the
 # resulting standins update the largefiles.
 @eh.wrapfunction(cmdutil, b'revert')
-def overriderevert(orig, ui, repo, ctx, parents, *pats, **opts):
+def overriderevert(orig, ui, repo, ctx, *pats, **opts):
     # Because we put the standins in a bad state (by updating them)
     # and then return them to a correct state we need to lock to
     # prevent others from changing them in their incorrect state.
@@ -937,7 +937,7 @@
             return m
 
         with extensions.wrappedfunction(scmutil, b'match', overridematch):
-            orig(ui, repo, ctx, parents, *pats, **opts)
+            orig(ui, repo, ctx, *pats, **opts)
 
         newstandins = lfutil.getstandinsstate(repo)
         filelist = lfutil.getlfilestoupdate(oldstandins, newstandins)
diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -1717,11 +1717,7 @@
             except:  # re-raises
                 self.ui.warn(_(b'cleaning up working directory...\n'))
                 cmdutil.revert(
-                    self.ui,
-                    repo,
-                    repo[b'.'],
-                    repo.dirstate.parents(),
-                    no_backup=True,
+                    self.ui, repo, repo[b'.'], no_backup=True,
                 )
                 # only remove unknown files that we know we touched or
                 # created while patching
diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -3493,9 +3493,9 @@
     return repo.status(match=scmutil.match(repo[None], pats, opts))
 
 
-def revert(ui, repo, ctx, parents, *pats, **opts):
+def revert(ui, repo, ctx, *pats, **opts):
     opts = pycompat.byteskwargs(opts)
-    parent, p2 = parents
+    parent, p2 = repo.dirstate.parents()
     node = ctx.node()
 
     mf = ctx.manifest()
@@ -3781,7 +3781,6 @@
             match = scmutil.match(repo[None], pats)
             _performrevert(
                 repo,
-                parents,
                 ctx,
                 names,
                 uipathfn,
@@ -3807,7 +3806,6 @@
 
 def _performrevert(
     repo,
-    parents,
     ctx,
     names,
     uipathfn,
@@ -3823,7 +3821,7 @@
 
     Make sure you have the working directory locked when calling this function.
     """
-    parent, p2 = parents
+    parent, p2 = repo.dirstate.parents()
     node = ctx.node()
     excluded_files = []
 
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -837,7 +837,7 @@
     else:
         hg.clean(repo, node, show_stats=False)
         repo.dirstate.setbranch(branch)
-        cmdutil.revert(ui, repo, rctx, repo.dirstate.parents())
+        cmdutil.revert(ui, repo, rctx)
 
     if opts.get(b'no_commit'):
         msg = _(b"changeset %s backed out, don't forget to commit.\n")
@@ -6301,9 +6301,7 @@
             hint = _(b"use --all to revert all files")
         raise error.Abort(msg, hint=hint)
 
-    return cmdutil.revert(
-        ui, repo, ctx, (parent, p2), *pats, **pycompat.strkwargs(opts)
-    )
+    return cmdutil.revert(ui, repo, ctx, *pats, **pycompat.strkwargs(opts))
 
 
 @command(
diff --git a/mercurial/shelve.py b/mercurial/shelve.py
--- a/mercurial/shelve.py
+++ b/mercurial/shelve.py
@@ -772,7 +772,7 @@
     with ui.configoverride({(b'ui', b'quiet'): True}):
         hg.update(repo, wctx.node())
         ui.pushbuffer(True)
-        cmdutil.revert(ui, repo, shelvectx, repo.dirstate.parents())
+        cmdutil.revert(ui, repo, shelvectx)
         ui.popbuffer()
 
 
diff --git a/mercurial/subrepo.py b/mercurial/subrepo.py
--- a/mercurial/subrepo.py
+++ b/mercurial/subrepo.py
@@ -986,12 +986,11 @@
 
     def filerevert(self, *pats, **opts):
         ctx = self._repo[opts['rev']]
-        parents = self._repo.dirstate.parents()
         if opts.get('all'):
             pats = [b'set:modified()']
         else:
             pats = []
-        cmdutil.revert(self.ui, self._repo, ctx, parents, *pats, **opts)
+        cmdutil.revert(self.ui, self._repo, ctx, *pats, **opts)
 
     def shortid(self, revid):
         return revid[:12]