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powerpc/64: Add GENERIC_CPU support for little endian

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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>
This commit is contained in:
Nicholas Piggin 2018-02-21 05:08:30 +10:00 committed by Michael Ellerman
parent 471d7ff8b5
commit a73657ea19
2 changed files with 11 additions and 2 deletions
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5
arch/powerpc/Makefile
View file

@ -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

8
arch/powerpc/platforms/Kconfig.cputype
View file

@ -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