[PATCH 7/9] powerpc/64/le: add GENERIC_CPU support
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2018-02-20 22:06:05
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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> --- arch/powerpc/Makefile | 5 +++++ arch/powerpc/platforms/Kconfig.cputype | 6 +++--- 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 2265d53023f4..973b1a1b98d2 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile@@ -144,8 +144,13 @@ CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions) CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD) ifeq ($(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 560466cc5170..ad878990c896 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.
@@ -96,8 +95,9 @@ choice If unsure, select Generic. config GENERIC_CPU - bool "Generic" - depends on !CPU_LITTLE_ENDIAN + bool "Generic" if !CPU_LITTLE_ENDIAN + bool "Generic (POWER8 and above)" if CPU_LITTLE_ENDIAN + select ARCH_HAS_FAST_MULTIPLIER if CPU_LITTLE_ENDIAN config CELL_CPU bool "Cell Broadband Engine"
--
2.16.1