Commit 1db9e051 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390: allow to set gcc -mtune flag 



Add a new Kconfig choice group which allows to configure how gcc should
tune the generated code (via -mtune option).
By default the -mtune parameter will match the -march parameter.

This is a rather large patch, but I wouldn't know how to make this shorter
unfortunately.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent b226635a

arch/s390/Kconfig

+61 −0
Original line number Diff line number Diff line
@@ -238,6 +238,67 @@ config MARCH_ZEC12 


endchoice



config MARCH_G5_TUNE

	def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT



config MARCH_Z900_TUNE

	def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT



config MARCH_Z990_TUNE

	def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT



config MARCH_Z9_109_TUNE

	def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT



config MARCH_Z10_TUNE

	def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT



config MARCH_Z196_TUNE

	def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT



config MARCH_ZEC12_TUNE

	def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT



choice

	prompt "Tune code generation"

	default TUNE_DEFAULT

	help

	  Cause the compiler to tune (-mtune) the generated code for a machine.

	  This will make the code run faster on the selected machine but

	  somewhat slower on other machines.

	  This option only changes how the compiler emits instructions, not the

	  selection of instructions itself, so the resulting kernel will run on

	  all other machines.



config TUNE_DEFAULT

	bool "Default"

	help

	  Tune the generated code for the target processor for which the kernel

	  will be compiled.



config TUNE_G5

	bool "System/390 model G5 and G6"



config TUNE_Z900

	bool "IBM zSeries model z800 and z900"



config TUNE_Z990

	bool "IBM zSeries model z890 and z990"



config TUNE_Z9_109

	bool "IBM System z9"



config TUNE_Z10

	bool "IBM System z10"



config TUNE_Z196

	bool "IBM zEnterprise 114 and 196"



config TUNE_ZEC12

	bool "IBM zBC12 and zEC12"



endchoice



config 64BIT

	def_bool y

	prompt "64 bit kernel"

arch/s390/Makefile

+8 −0
Original line number Diff line number Diff line
@@ -43,6 +43,14 @@ cflags-$(CONFIG_MARCH_Z10) += -march=z10 
cflags-$(CONFIG_MARCH_Z196)   += -march=z196

cflags-$(CONFIG_MARCH_ZEC12)  += -march=zEC12



cflags-$(CONFIG_MARCH_G5_TUNE)		+= -mtune=g5

cflags-$(CONFIG_MARCH_Z900_TUNE)	+= -mtune=z900

cflags-$(CONFIG_MARCH_Z990_TUNE)	+= -mtune=z990

cflags-$(CONFIG_MARCH_Z9_109_TUNE)	+= -mtune=z9-109

cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10

cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196

cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12



#KBUILD_IMAGE is necessary for make rpm

KBUILD_IMAGE	:=arch/s390/boot/image

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