[PATCH 1/2] powerpc/64: Move CPU -mtune options into Kconfig

[Michael Ellerman]

Currently the -mtune options are set in the Makefile, depending on what
is the compiler supports.

One downside of doing it that way is that the chosen -mtune option is
not recorded in the .config.

Another downside is that doing more complicated logic to calculate the
correct option gets messy in the Makefile.

So move the determination of which -mtune option to use into Kconfig
logic.

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/Makefile                  | 4 +---
 arch/powerpc/platforms/Kconfig.cputype | 6 ++++++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 87d6ac27eebd..779956007f0c 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -156,9 +156,7 @@ endif
 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
 
-CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10,	\
-				  $(call cc-option,-mtune=power9,	\
-				  $(call cc-option,-mtune=power8)))
+CFLAGS-y += $(CONFIG_TUNE_CPU)
 
 asinstr := $(call as-instr,lis 9$(comma)foo at high,-DHAVE_AS_ATHIGH=1)
 
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 046b571496b1..7d7477b73951 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -273,6 +273,12 @@ config TARGET_CPU
 	default "e500mc" if E500MC_CPU
 	default "powerpc" if POWERPC_CPU
 
+config TUNE_CPU
+	string
+	default "-mtune=power10" if POWERPC64_CPU && CC_IS_GCC   && $(cc-option,-mtune=power10)
+	default "-mtune=power9"  if POWERPC64_CPU && CC_IS_GCC   && $(cc-option,-mtune=power9)
+	default "-mtune=power8"  if POWERPC64_CPU && CC_IS_GCC   && $(cc-option,-mtune=power8)
+
 config PPC_BOOK3S
 	def_bool y
 	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
-- 
2.39.2