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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-02-20 22:08:30 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-04-01 14:52:52 +0300 |
| commit | a73657ea19aeb92f98438263d42f90188f115d58 (patch) | |
| tree | 7971c9025369b30fab25b416136f40bd24961bbf /arch | |
| parent | 471d7ff8b51b63521c8ea35c51966ab4caa434ee (diff) | |
| download | linux-a73657ea19aeb92f98438263d42f90188f115d58.tar.xz | |
powerpc/64: Add GENERIC_CPU support for little endian
Add GENERIC_CPU support for little-endian rather than using POWER8
specific selection for POWER9 and above.
Restrict GENERIC_CPU to POWER8 and above on little endian.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Duplicate GENERIC_CPU to avoid a kbuild warning about the prompt
being redefined. Spell out that GENERIC means >= POWER4 for BE.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Makefile | 5 | ||||
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 8 |
2 files changed, 11 insertions, 2 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 373d7f5b7cde..d6fa14077763 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -146,8 +146,13 @@ CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD) CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata) ifeq ($(CONFIG_PPC_BOOK3S_64),y) +ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y) +CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8 +CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power8) +else CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5)) CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4) +endif else CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64 endif diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index fdae4584a016..e8eac27db592 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -87,7 +87,6 @@ endchoice choice prompt "CPU selection" depends on PPC64 - default POWER8_CPU if CPU_LITTLE_ENDIAN default GENERIC_CPU help This will create a kernel which is optimised for a particular CPU. @@ -96,9 +95,14 @@ choice If unsure, select Generic. config GENERIC_CPU - bool "Generic" + bool "Generic (POWER4 and above)" depends on !CPU_LITTLE_ENDIAN +config GENERIC_CPU + bool "Generic (POWER8 and above)" + depends on CPU_LITTLE_ENDIAN + select ARCH_HAS_FAST_MULTIPLIER + config CELL_CPU bool "Cell Broadband Engine" depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN |