linux-kernel - [PATCH 3.18 12/50] ARM: 8458/1: bL

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Date:   Mon,  1 Apr 2019 19:02:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Nicolas Pitre <nico@...aro.org>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 3.18 12/50] ARM: 8458/1: bL_switcher: add GIC dependency

3.18-stable review patch.  If anyone has any objections, please let me know.

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

[ Upstream commit 6c044fecdf78be3fda159a5036bb33700cdd5e59 ]

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>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 89c4b5ccc68d..bd3a806df001 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1432,7 +1432,7 @@ 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
-- 
2.19.1