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)

7 files changed, 23 insertions, 4 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 16a4b9e689b..eca82f9a717 100644
--- 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
index 7f2347bd6cc..e1efbca2a53 100644
--- 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
index 5f7f9c2a34a..29a3d616779 100644
--- 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
index ebde97f5d5f..e6beaff7621 100644
--- 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
index c8415784e60..bb1b670ab7b 100644
--- 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
index 3dd620f8dd9..c593be428b8 100644
--- 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
index a8aefc8a6f2..9b3d0fbaee7 100644
--- 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
 
 endmenu