[PATCH] ARM: bL_switcher: add GIC dependency

[arnd@arndb.de (Arnd Bergmann)]

It is not possible to build the bL_switcher code if the GIC
driver is disabled, because it relies on calling into some
gic specific interfaces, and that would result in this build
error:

arch/arm/common/built-in.o: In function `bL_switch_to':
:(.text+0x1230): undefined reference to `gic_get_sgir_physaddr'
:(.text+0x1244): undefined reference to `gic_send_sgi'
:(.text+0x1268): undefined reference to `gic_migrate_target'
arch/arm/common/built-in.o: In function `bL_switcher_enable.part.4':
:(.text.unlikely+0x2f8): undefined reference to `gic_get_cpu_id'

This adds a Kconfig dependency to ensure we only build the big-little
switcher if the GIC driver is present as well.

Almost all ARMv7 platforms come with a GIC anyway, but it is possible
to build a kernel that disables all platforms.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4b68867641f9..6aa2a766be66 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1420,7 +1420,7 @@ config BIG_LITTLE
 
 config BL_SWITCHER
 	bool "big.LITTLE switcher support"
-	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
+	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC
 	select ARM_CPU_SUSPEND
 	select CPU_PM
 	help