--- a/contrib/perf.py	Mon Dec 14 18:54:03 2015 -0500
+++ b/contrib/perf.py	Mon Dec 14 20:37:41 2015 -0500
@@ -253,7 +253,7 @@
         # acceptremote is True because we don't want prompts in the middle of
         # our benchmark
         merge.calculateupdates(repo, wctx, rctx, [ancestor], False, False,
-                               False, acceptremote=True, followcopies=True)
+                               acceptremote=True, followcopies=True)
     timer(d)
     fm.end()
 
@@ -679,4 +679,3 @@
         timer, fm = gettimer(ui, opts)
         timer(fn, title=title)
         fm.end()
-

--- a/hgext/convert/hg.py	Mon Dec 14 18:54:03 2015 -0500
+++ b/hgext/convert/hg.py	Mon Dec 14 20:37:41 2015 -0500
@@ -192,7 +192,6 @@
             self.repo, p1ctx, p2ctx, anc,
             True,  # branchmerge
             True,  # force
-            False, # partial
             False, # acceptremote
             False, # followcopies
         )

--- a/hgext/largefiles/overrides.py	Mon Dec 14 18:54:03 2015 -0500
+++ b/hgext/largefiles/overrides.py	Mon Dec 14 20:37:41 2015 -0500
@@ -458,11 +458,11 @@
 # writing the files into the working copy and lfcommands.updatelfiles
 # will update the largefiles.
 def overridecalculateupdates(origfn, repo, p1, p2, pas, branchmerge, force,
-                             partial, acceptremote, followcopies):
+                             acceptremote, followcopies, matcher=None):
     overwrite = force and not branchmerge
     actions, diverge, renamedelete = origfn(
-        repo, p1, p2, pas, branchmerge, force, partial, acceptremote,
-        followcopies)
+        repo, p1, p2, pas, branchmerge, force, acceptremote,
+        followcopies, matcher=matcher)
 
     if overwrite:
         return actions, diverge, renamedelete

--- a/mercurial/merge.py	Mon Dec 14 18:54:03 2015 -0500
+++ b/mercurial/merge.py	Mon Dec 14 20:37:41 2015 -0500
@@ -841,9 +841,13 @@
             # remote did change but ended up with same content
             del actions[f] # don't get = keep local deleted
 
-def calculateupdates(repo, wctx, mctx, ancestors, branchmerge, force, partial,
-                     acceptremote, followcopies):
+def calculateupdates(repo, wctx, mctx, ancestors, branchmerge, force,
+                     acceptremote, followcopies, matcher=None):
     "Calculate the actions needed to merge mctx into wctx using ancestors"
+    if matcher is None or matcher.always():
+        partial = False
+    else:
+        partial = matcher.matchfn
 
     if len(ancestors) == 1: # default
         actions, diverge, renamedelete = manifestmerge(
@@ -1414,13 +1418,9 @@
             followcopies = True
 
         ### calculate phase
-        if matcher is None or matcher.always():
-            partial = False
-        else:
-            partial = matcher.matchfn
         actionbyfile, diverge, renamedelete = calculateupdates(
-            repo, wc, p2, pas, branchmerge, force, partial, mergeancestor,
-            followcopies)
+            repo, wc, p2, pas, branchmerge, force, mergeancestor,
+            followcopies, matcher=matcher)
         # Convert to dictionary-of-lists format
         actions = dict((m, []) for m in 'a am f g cd dc r dm dg m e k'.split())
         for f, (m, args, msg) in actionbyfile.iteritems():