linux-kernel - [PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

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Date:   Thu,  7 Jun 2018 10:10:18 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 1/3] powerpc: make CPU selection logic generic in Makefile

At the time being, when adding a new CPU for selection, both
Kconfig.cputype and Makefile have to be modified.

This patch moves into Kconfig.cputype the name of the CPU to me
passed to the -mcpu= argument.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/Makefile                  |  8 +-------
 arch/powerpc/platforms/Kconfig.cputype | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 9704ab360d39..9a5642552abc 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -175,13 +175,7 @@ ifdef CONFIG_MPROFILE_KERNEL
     endif
 endif
 
-CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
-CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
-CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
-CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
-CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)
-CFLAGS-$(CONFIG_POWER9_CPU) += $(call cc-option,-mcpu=power9)
-CFLAGS-$(CONFIG_PPC_8xx) += $(call cc-option,-mcpu=860)
+CFLAGS-$(CONFIG_SPECIAL_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_SPECIAL_CPU))
 
 # Altivec option not allowed with e500mc64 in GCC.
 ifeq ($(CONFIG_ALTIVEC),y)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index cc892dcfa114..71ef559cc474 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -140,6 +140,21 @@ config E6500_CPU
 
 endchoice
 
+config SPECIAL_CPU_BOOL
+	bool
+	default !GENERIC_CPU
+
+config SPECIAL_CPU
+	string
+	depends on SPECIAL_CPU_BOOL
+	default "cell" if CELL_CPU
+	default "power5" if POWER5_CPU
+	default "power6" if POWER6_CPU
+	default "power7" if POWER7_CPU
+	default "power8" if POWER8_CPU
+	default "power9" if POWER9_CPU
+	default "860" if PPC_8xx
+
 config PPC_BOOK3S
 	def_bool y
 	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
-- 
2.13.3