ARM: SMP: Refactor Kconfig to be more maintainable

Making SMP depend on (huge list of MACH_ and ARCH_ configs) is bothersome to maintain and likely to lead to merge conflicts. This patch moves the knowledge of which platforms are SMP-capable to the individual machines. To enable this, a new HAVE_SMP config option is introduced to allow machines to indicate that they can run in a SMP configuration. Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> (for nomadik, ux500) Acked-by: Tony Lindgren <tony@atomide.com> (for omap) Acked-by: Kukjin Kim <kgene.kim@samsung.com> (for exynos) Acked-by: Sascha Hauer <s.hauer@pengutronix.de> (for imx) Acked-by: Olof Johansson <olof@lixom.net> (for tegra)
mariux64 · Dec 19, 2011 · 3b55658 · 3b55658
1 parent ce5ea9f
commit 3b55658
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Showing 7 changed files with 23 additions and 4 deletions.
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
@@ -344,6 +344,7 @@ config ARCH_HIGHBANK
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
 	select HAVE_ARM_SCU
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	select USE_OF
 	help
@@ -636,6 +637,7 @@ config ARCH_TEGRA
 	select GENERIC_GPIO
 	select HAVE_CLK
 	select HAVE_SCHED_CLOCK
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	select ARCH_HAS_CPUFREQ
 	help
@@ -706,6 +708,7 @@ config ARCH_SHMOBILE
 	select HAVE_CLK
 	select CLKDEV_LOOKUP
 	select HAVE_MACH_CLKDEV
+	select HAVE_SMP
 	select GENERIC_CLOCKEVENTS
 	select MIGHT_HAVE_CACHE_L2X0
 	select NO_IOPORT
@@ -909,6 +912,7 @@ config ARCH_U8500
 	select CLKDEV_LOOKUP
 	select ARCH_REQUIRE_GPIOLIB
 	select ARCH_HAS_CPUFREQ
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	help
 	  Support for ST-Ericsson's Ux500 architecture
@@ -1430,14 +1434,20 @@ menu "Kernel Features"
 
 source "kernel/time/Kconfig"
 
+config HAVE_SMP
+	bool
+	help
+	  This option should be selected by machines which have an SMP-
+	  capable CPU.
+
+	  The only effect of this option is to make the SMP-related
+	  options available to the user for configuration.
+
 config SMP
 	bool "Symmetric Multi-Processing"
 	depends on CPU_V6K || CPU_V7
 	depends on GENERIC_CLOCKEVENTS
-	depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
-		 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
-		 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
-		 ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_HIGHBANK || SOC_IMX6Q
+	depends on HAVE_SMP
 	depends on MMU
 	select USE_GENERIC_SMP_HELPERS
 	select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
@@ -17,6 +17,7 @@ choice
 
 config ARCH_EXYNOS4
 	bool "SAMSUNG EXYNOS4"
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	help
 	  Samsung EXYNOS4 SoCs based systems

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
@@ -615,6 +615,7 @@ config SOC_IMX6Q
 	select HAVE_IMX_GPC
 	select HAVE_IMX_MMDC
 	select HAVE_IMX_SRC
+	select HAVE_SMP
 	select USE_OF
 
 	help

diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
@@ -67,6 +67,7 @@ config MSM_SOC_REV_A
 	bool
 config  ARCH_MSM_SCORPIONMP
 	bool
+	select HAVE_SMP
 
 config  ARCH_MSM_ARM11
 	bool

diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
@@ -43,6 +43,7 @@ config ARCH_OMAP4
 	depends on ARCH_OMAP2PLUS
 	select CPU_V7
 	select ARM_GIC
+	select HAVE_SMP
 	select LOCAL_TIMERS if SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	select PL310_ERRATA_588369

diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig
@@ -12,6 +12,7 @@ config REALVIEW_EB_A9MP
 	bool "Support Multicore Cortex-A9 Tile"
 	depends on MACH_REALVIEW_EB
 	select CPU_V7
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	help
 	  Enable support for the Cortex-A9MPCore tile fitted to the
@@ -22,6 +23,7 @@ config REALVIEW_EB_ARM11MP
 	depends on MACH_REALVIEW_EB
 	select CPU_V6K
 	select ARCH_HAS_BARRIERS if SMP
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	help
 	  Enable support for the ARM11MPCore tile fitted to the Realview(R)
@@ -41,6 +43,7 @@ config MACH_REALVIEW_PB11MP
 	select CPU_V6K
 	select ARM_GIC
 	select HAVE_PATA_PLATFORM
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	select ARCH_HAS_BARRIERS if SMP
 	help
@@ -82,6 +85,7 @@ config MACH_REALVIEW_PBX
 	bool "Support RealView(R) Platform Baseboard Explore"
 	select ARM_GIC
 	select HAVE_PATA_PLATFORM
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 	select ARCH_SPARSEMEM_ENABLE if CPU_V7 && !REALVIEW_HIGH_PHYS_OFFSET
 	select ZONE_DMA if SPARSEMEM

diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
@@ -8,6 +8,7 @@ config ARCH_VEXPRESS_CA9X4
 	select ARM_ERRATA_720789
 	select ARM_ERRATA_751472
 	select ARM_ERRATA_753970
+	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
 
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