linux-kernel - [PATCH] ARM: imx: provide v7_cpu_resume() only on ARM_CPU

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Date:   Mon, 23 Mar 2020 09:19:33 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Rouven Czerwinski <r.czerwinski@...gutronix.de>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     stable@...r.kernel.org,
        Clemens Gruber <clemens.gruber@...ruber.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: imx: provide v7_cpu_resume() only on ARM_CPU_SUSPEND=y

512a928affd5 ("ARM: imx: build v7_cpu_resume() unconditionally")
introduced an unintended linker error for i.MX6 configurations that have
ARM_CPU_SUSPEND=n which can happen if neither CONFIG_PM, CONFIG_CPU_IDLE,
nor ARM_PSCI_FW are selected.

Fix this by having v7_cpu_resume() compiled only when cpu_resume() it
calls is available as well.

The C declaration for the function remains unguarded to avoid future code
inadvertently using a stub and introducing a regression to the bug the
original commit fixed.

Cc: <stable@...r.kernel.org>
Fixes: 512a928affd5 ("ARM: imx: build v7_cpu_resume() unconditionally")
Reported-by: Clemens Gruber <clemens.gruber@...ruber.com>
Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
 arch/arm/mach-imx/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 03506ce46149..e7364e6c8c6b 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -91,8 +91,10 @@ AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
 obj-$(CONFIG_SOC_IMX6) += suspend-imx6.o
 obj-$(CONFIG_SOC_IMX53) += suspend-imx53.o
 endif
+ifeq ($(CONFIG_ARM_CPU_SUSPEND),y)
 AFLAGS_resume-imx6.o :=-Wa,-march=armv7-a
 obj-$(CONFIG_SOC_IMX6) += resume-imx6.o
+endif
 obj-$(CONFIG_SOC_IMX6) += pm-imx6.o
 
 obj-$(CONFIG_SOC_IMX1) += mach-imx1.o
-- 
2.25.1