linux-kernel - [PATCH 3.16 26/63] ARM: 8458/1: bL

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Date:   Wed, 08 Jan 2020 19:43:24 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Arnd Bergmann" <arnd@...db.de>,
        "Russell King" <rmk+kernel@....linux.org.uk>,
        "Nicolas Pitre" <nico@...aro.org>
Subject: [PATCH 3.16 26/63] ARM: 8458/1: bL_switcher: add GIC dependency

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit 6c044fecdf78be3fda159a5036bb33700cdd5e59 upstream.

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@...db.de>
Acked-by: Nicolas Pitre <nico@...aro.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/arm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1485,7 +1485,7 @@ 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