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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-10-30 12:12:50 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-31 09:54:01 +0100 |
| commit | 1db9e0513d7478f6c80ca0bc4f58f53fe49e27f8 (patch) | |
| tree | 511995f3ff6a9577b8a93a6eb2192febe8a8f353 /arch | |
| parent | s390/percpu: remove this_cpu_xor() implementation (diff) | |
| download | linux-dev-1db9e0513d7478f6c80ca0bc4f58f53fe49e27f8.tar.xz linux-dev-1db9e0513d7478f6c80ca0bc4f58f53fe49e27f8.zip | |
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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/Kconfig | 61 | ||||
| -rw-r--r-- | arch/s390/Makefile | 8 |
2 files changed, 69 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index a02177fb5ec1..f75d7e517927 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -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" diff --git a/arch/s390/Makefile b/arch/s390/Makefile index ecc9d4f73cc6..874e6d6e9c5f 100644 --- a/arch/s390/Makefile +++ b/arch/s390/Makefile @@ -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 |