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)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1016c969641593e4f6b2fc75a6ee06dae0a0c44c..8e4a564e53992689760ba6908217fc0c86692659 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1341,14 +1341,20 @@ 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
+       depends on HAVE_SMP
        depends on MMU
        select USE_GENERIC_SMP_HELPERS
        select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP