linux-kernel - [PATCH] cpufreq: kryo: allow building as a loadable module

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Date:   Tue,  5 Jun 2018 13:44:24 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Ilia Lin <ilialin@...eaurora.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] cpufreq: kryo: allow building as a loadable module

Building the kryo cpufreq driver while QCOM_SMEM is a loadable module
results in a link error:

drivers/cpufreq/qcom-cpufreq-kryo.o: In function `qcom_cpufreq_kryo_probe':
qcom-cpufreq-kryo.c:(.text+0xbc): undefined reference to `qcom_smem_get'

The problem is that Kconfig ignores interprets the dependency as met
when the dependent symbol is a 'bool' one. By making it 'tristate',
it will be forced to be a module here, which builds successfully.

Fixes: 46e2856b8e18 ("cpufreq: Add Kryo CPU scaling driver")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/cpufreq/Kconfig.arm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index c7ce928fbf1f..52f5f1a2040c 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -125,7 +125,7 @@ config ARM_OMAP2PLUS_CPUFREQ
 	default ARCH_OMAP2PLUS
 
 config ARM_QCOM_CPUFREQ_KRYO
-	bool "Qualcomm Kryo based CPUFreq"
+	tristate "Qualcomm Kryo based CPUFreq"
 	depends on ARM64
 	depends on QCOM_QFPROM
 	depends on QCOM_SMEM
-- 
2.9.0