Subject: [PATCH 7/9] powerpc/64/le: add GENERIC_CPU support

From: Nicholas Piggin <[email-masked]>
Date: Wed, 21 Feb 2018 05:08:30 +1000

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 <[email-masked]>
---
 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