diff --git a/include/clang/Basic/DiagnosticLexKinds.td b/include/clang/Basic/DiagnosticLexKinds.td
index 9b06fa8..76c211e 100644
--- a/include/clang/Basic/DiagnosticLexKinds.td
+++ b/include/clang/Basic/DiagnosticLexKinds.td
@@ -244,15 +244,11 @@ def ext_stdc_pragma_syntax_eom :
 def warn_stdc_fenv_access_not_supported :
    Warning<"pragma STDC FENV_ACCESS ON is not supported, ignoring pragma">,
    InGroup<UnknownPragmas>;
-def warn_pragma_diagnostic_gcc_invalid :
-   ExtWarn<"pragma diagnostic expected 'error', 'warning', 'ignored', or"
-            " 'fatal'">,
-   InGroup<UnknownPragmas>;
-def warn_pragma_diagnostic_clang_invalid :
-   ExtWarn<"pragma diagnostic expected 'error', 'warning', 'ignored', 'fatal'"
+def warn_pragma_diagnostic_invalid :
+   ExtWarn<"pragma diagnostic expected 'error', 'warning', 'ignored', 'fatal',"
             " 'push', or 'pop'">,
    InGroup<UnknownPragmas>;
-def warn_pragma_diagnostic_clang_cannot_ppp :
+def warn_pragma_diagnostic_cannot_pop :
    ExtWarn<"pragma diagnostic pop could not pop, no matching push">,
    InGroup<UnknownPragmas>;
 def warn_pragma_diagnostic_invalid_option :
diff --git a/lib/Lex/Pragma.cpp b/lib/Lex/Pragma.cpp
index 783900d..a74ff33 100644
--- a/lib/Lex/Pragma.cpp
+++ b/lib/Lex/Pragma.cpp
@@ -588,7 +588,7 @@ struct PragmaDebugHandler : public PragmaHandler {
     Token Tok;
     PP.LexUnexpandedToken(Tok);
     if (Tok.isNot(tok::identifier)) {
-      PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_invalid);
+      PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
       return;
     }
     IdentifierInfo *II = Tok.getIdentifierInfo();
@@ -610,23 +610,14 @@ struct PragmaDebugHandler : public PragmaHandler {
 };
 
 /// PragmaDiagnosticHandler - e.g. '#pragma GCC diagnostic ignored "-Wformat"'
-/// Since clang's diagnostic supports extended functionality beyond GCC's
-/// the constructor takes a clangMode flag to tell it whether or not to allow
-/// clang's extended functionality, or whether to reject it.
 struct PragmaDiagnosticHandler : public PragmaHandler {
-private:
-  const bool ClangMode;
 public:
-  explicit PragmaDiagnosticHandler(const bool clangMode)
-    : PragmaHandler("diagnostic"), ClangMode(clangMode) {}
-
+  explicit PragmaDiagnosticHandler() : PragmaHandler("diagnostic") {}
   virtual void HandlePragma(Preprocessor &PP, Token &DiagToken) {
     Token Tok;
     PP.LexUnexpandedToken(Tok);
     if (Tok.isNot(tok::identifier)) {
-      unsigned Diag = ClangMode ? diag::warn_pragma_diagnostic_clang_invalid
-                                 : diag::warn_pragma_diagnostic_gcc_invalid;
-      PP.Diag(Tok, Diag);
+      PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
       return;
     }
     IdentifierInfo *II = Tok.getIdentifierInfo();
@@ -640,22 +631,16 @@ public:
       Map = diag::MAP_IGNORE;
     else if (II->isStr("fatal"))
       Map = diag::MAP_FATAL;
-    else if (ClangMode) {
-      if (II->isStr("pop")) {
-        if (!PP.getDiagnostics().popMappings())
-          PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_cannot_ppp);
-        return;
-      }
-
-      if (II->isStr("push")) {
-        PP.getDiagnostics().pushMappings();
-        return;
-      }
-
-      PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_invalid);
+    else if (II->isStr("pop")) {
+      if (!PP.getDiagnostics().popMappings())
+        PP.Diag(Tok, diag::warn_pragma_diagnostic_cannot_pop);
+
+      return;
+    } else if (II->isStr("push")) {
+      PP.getDiagnostics().pushMappings();
       return;
     } else {
-      PP.Diag(Tok, diag::warn_pragma_diagnostic_gcc_invalid);
+      PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
       return;
     }
 
@@ -687,9 +672,7 @@ public:
     if (Literal.hadError)
       return;
     if (Literal.Pascal) {
-      unsigned Diag = ClangMode ? diag::warn_pragma_diagnostic_clang_invalid
-                                 : diag::warn_pragma_diagnostic_gcc_invalid;
-      PP.Diag(Tok, Diag);
+      PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
       return;
     }
 
@@ -812,13 +795,13 @@ void Preprocessor::RegisterBuiltinPragmas() {
   AddPragmaHandler("GCC", new PragmaPoisonHandler());
   AddPragmaHandler("GCC", new PragmaSystemHeaderHandler());
   AddPragmaHandler("GCC", new PragmaDependencyHandler());
-  AddPragmaHandler("GCC", new PragmaDiagnosticHandler(false));
+  AddPragmaHandler("GCC", new PragmaDiagnosticHandler());
   // #pragma clang ...
   AddPragmaHandler("clang", new PragmaPoisonHandler());
   AddPragmaHandler("clang", new PragmaSystemHeaderHandler());
   AddPragmaHandler("clang", new PragmaDebugHandler());
   AddPragmaHandler("clang", new PragmaDependencyHandler());
-  AddPragmaHandler("clang", new PragmaDiagnosticHandler(true));
+  AddPragmaHandler("clang", new PragmaDiagnosticHandler());
 
   AddPragmaHandler("STDC", new PragmaSTDC_FP_CONTRACTHandler());
   AddPragmaHandler("STDC", new PragmaSTDC_FENV_ACCESSHandler());
diff --git a/test/Preprocessor/pragma_diagnostic.c b/test/Preprocessor/pragma_diagnostic.c
index d157406..818f02f 100644
--- a/test/Preprocessor/pragma_diagnostic.c
+++ b/test/Preprocessor/pragma_diagnostic.c
@@ -20,9 +20,8 @@
 #endif
 
 
-
 #define foo error
-#pragma GCC diagnostic foo "-Wundef"  // expected-warning {{pragma diagnostic expected 'error', 'warning', 'ignored', or 'fatal'}}
+#pragma GCC diagnostic foo "-Wundef"  // expected-warning {{pragma diagnostic expected 'error', 'warning', 'ignored', 'fatal', 'push', or 'pop'}}
 
 #pragma GCC diagnostic error 42  // expected-warning {{unexpected token in pragma diagnostic}}
 
diff --git a/test/Preprocessor/pushable-diagnostics.c b/test/Preprocessor/pushable-diagnostics.c
index 6c861a1..567a866 100644
--- a/test/Preprocessor/pushable-diagnostics.c
+++ b/test/Preprocessor/pushable-diagnostics.c
@@ -2,7 +2,7 @@
 
 #pragma clang diagnostic pop // expected-warning{{pragma diagnostic pop could not pop, no matching push}}
 
-#pragma clang diagnostic puhs // expected-warning{{pragma diagnostic expected 'error', 'warning', 'ignored', 'fatal' 'push', or 'pop'}}
+#pragma clang diagnostic puhs // expected-warning {{pragma diagnostic expected 'error', 'warning', 'ignored', 'fatal', 'push', or 'pop'}}
 
 char a = 'df'; // expected-warning{{multi-character character constant}}