s390: allow to compile with z16 optimizations

Add config and compile options which allow to compile with z16
optimizations if the compiler supports it.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/Kconfig

@@ -255,6 +255,10 @@ config HAVE_MARCH_Z15_FEATURES
 	def_bool n
 	select HAVE_MARCH_Z14_FEATURES
 
+config HAVE_MARCH_Z16_FEATURES
+	def_bool n
+	select HAVE_MARCH_Z15_FEATURES
+
 choice
 	prompt "Processor type"
 	default MARCH_Z196
@@ -312,6 +316,14 @@ config MARCH_Z15
 	  and 8561 series). The kernel will be slightly faster but will not
 	  work on older machines.
 
+config MARCH_Z16
+	bool "IBM z16"
+	select HAVE_MARCH_Z16_FEATURES
+	depends on $(cc-option,-march=z16)
+	help
+	  Select this to enable optimizations for IBM z16 (3931 and
+	  3932 series).
+
 endchoice
 
 config MARCH_Z10_TUNE
@@ -332,6 +344,9 @@ config MARCH_Z14_TUNE
 config MARCH_Z15_TUNE
 	def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
 
+config MARCH_Z16_TUNE
+	def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
+
 choice
 	prompt "Tune code generation"
 	default TUNE_DEFAULT
@@ -372,6 +387,10 @@ config TUNE_Z15
 	bool "IBM z15"
 	depends on $(cc-option,-mtune=z15)
 
+config TUNE_Z16
+	bool "IBM z16"
+	depends on $(cc-option,-mtune=z16)
+
 endchoice
 
 config 64BIT

arch/s390/Makefile

@@ -42,6 +42,7 @@ mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
+mflags-$(CONFIG_MARCH_Z16)    := -march=z16
 
 export CC_FLAGS_MARCH := $(mflags-y)
 
@@ -54,6 +55,7 @@ cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
 cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
 cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14
 cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15
+cflags-$(CONFIG_MARCH_Z16_TUNE)		+= -mtune=z16
 
 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include