--- a/common/autoconf/flags.m4	Thu Oct 20 13:44:00 2016 -0700
+++ b/common/autoconf/flags.m4	Thu Oct 20 16:53:56 2016 -0700
@@ -759,6 +759,10 @@
         # on ppc we don't prevent gcc to omit frame pointer but do prevent strict aliasing
         $2CFLAGS_JDK="${$2CFLAGS_JDK} -fno-strict-aliasing"
         ;;
+      s390 )
+        $2COMMON_CCXXFLAGS_JDK="[$]$2COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer -mbackchain -march=z10"
+        $2CFLAGS_JDK="${$2CFLAGS_JDK} -fno-strict-aliasing"
+        ;;
       * )
         $2COMMON_CCXXFLAGS_JDK="[$]$2COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer"
         $2CFLAGS_JDK="${$2CFLAGS_JDK} -fno-strict-aliasing"
@@ -940,6 +944,10 @@
       # Use Power8, this is the first CPU to support PPC64 LE with ELFv2 ABI.
       $2JVM_CFLAGS="[$]$2JVM_CFLAGS -mcpu=power7 -mtune=power8"
     fi
+  elif test "x$OPENJDK_$1_CPU" = xs390x; then
+    if test "x$OPENJDK_$1_OS" = xlinux; then
+      $2JVM_CFLAGS="[$]$2JVM_CFLAGS -mbackchain -march=z10"
+    fi
   fi
 
   if test "x$OPENJDK_$1_CPU_ENDIAN" = xlittle; then

--- a/common/autoconf/generated-configure.sh	Thu Oct 20 13:44:00 2016 -0700
+++ b/common/autoconf/generated-configure.sh	Thu Oct 20 16:53:56 2016 -0700
@@ -5093,7 +5093,7 @@
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1476275292
+DATE_WHEN_GENERATED=1476374246
 
 ###############################################################################
 #
@@ -49840,6 +49840,10 @@
         # on ppc we don't prevent gcc to omit frame pointer but do prevent strict aliasing
         CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
         ;;
+      s390 )
+        COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer -mbackchain -march=z10"
+        CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
+        ;;
       * )
         COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer"
         CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
@@ -50122,6 +50126,10 @@
       # Use Power8, this is the first CPU to support PPC64 LE with ELFv2 ABI.
       JVM_CFLAGS="$JVM_CFLAGS -mcpu=power7 -mtune=power8"
     fi
+  elif test "x$OPENJDK_TARGET_CPU" = xs390x; then
+    if test "x$OPENJDK_TARGET_OS" = xlinux; then
+      JVM_CFLAGS="$JVM_CFLAGS -mbackchain -march=z10"
+    fi
   fi
 
   if test "x$OPENJDK_TARGET_CPU_ENDIAN" = xlittle; then
@@ -50655,6 +50663,10 @@
         # on ppc we don't prevent gcc to omit frame pointer but do prevent strict aliasing
         OPENJDK_BUILD_CFLAGS_JDK="${OPENJDK_BUILD_CFLAGS_JDK} -fno-strict-aliasing"
         ;;
+      s390 )
+        OPENJDK_BUILD_COMMON_CCXXFLAGS_JDK="$OPENJDK_BUILD_COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer -mbackchain -march=z10"
+        OPENJDK_BUILD_CFLAGS_JDK="${OPENJDK_BUILD_CFLAGS_JDK} -fno-strict-aliasing"
+        ;;
       * )
         OPENJDK_BUILD_COMMON_CCXXFLAGS_JDK="$OPENJDK_BUILD_COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer"
         OPENJDK_BUILD_CFLAGS_JDK="${OPENJDK_BUILD_CFLAGS_JDK} -fno-strict-aliasing"
@@ -50937,6 +50949,10 @@
       # Use Power8, this is the first CPU to support PPC64 LE with ELFv2 ABI.
       OPENJDK_BUILD_JVM_CFLAGS="$OPENJDK_BUILD_JVM_CFLAGS -mcpu=power7 -mtune=power8"
     fi
+  elif test "x$OPENJDK_BUILD_CPU" = xs390x; then
+    if test "x$OPENJDK_BUILD_OS" = xlinux; then
+      OPENJDK_BUILD_JVM_CFLAGS="$OPENJDK_BUILD_JVM_CFLAGS -mbackchain -march=z10"
+    fi
   fi
 
   if test "x$OPENJDK_BUILD_CPU_ENDIAN" = xlittle; then

--- a/test/Makefile	Thu Oct 20 13:44:00 2016 -0700
+++ b/test/Makefile	Thu Oct 20 16:53:56 2016 -0700
@@ -74,13 +74,14 @@
 jaxp_%:
 	@$(NO_STOPPING)$(call SUBDIR_TEST, $(JAXP_DIR), CONCURRENCY=$(JDK_TEST_JOBS) TEST="$@" $@)
 
-ifeq ($(TEST_JOBS), 0)
-  HOTSPOT_TEST_JOBS=1
-else
-  HOTSPOT_TEST_JOBS=$(TEST_JOBS)
+SUB_MAKE_ARGS :=
+ifneq ($(TEST_JOBS), 0)
+  ifneq ($(TEST_JOBS), )
+    SUB_MAKE_ARGS += CONCURRENCY=$(TEST_JOBS)
+  endif
 endif
 hotspot_%:
-	@$(NO_STOPPING)$(call SUBDIR_TEST, $(HOTSPOT_DIR), CONCURRENCY=$(HOTSPOT_TEST_JOBS) TEST="$@" $@)
+	@$(NO_STOPPING)$(call SUBDIR_TEST, $(HOTSPOT_DIR), $(SUB_MAKE_ARGS) TEST="$@" $@)
 
 #
 # jtreg_tests