linux-kernel - [PATCH v3] cpufreq: qcom-kryo: Fix section annotations

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Date:   Wed, 19 Sep 2018 17:22:21 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Ilia Lin <ilia.lin@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH v3] cpufreq: qcom-kryo: Fix section annotations

There is currently a warning when building the Kryo cpufreq driver into
the kernel image:

WARNING: vmlinux.o(.text+0x8aa424): Section mismatch in reference from
the function qcom_cpufreq_kryo_probe() to the function
.init.text:qcom_cpufreq_kryo_get_msm_id()
The function qcom_cpufreq_kryo_probe() references
the function __init qcom_cpufreq_kryo_get_msm_id().
This is often because qcom_cpufreq_kryo_probe lacks a __init
annotation or the annotation of qcom_cpufreq_kryo_get_msm_id is wrong.

Remove the '__init' annotation from qcom_cpufreq_kryo_get_msm_id
so that there is no more mismatch warning.

Additionally, Nick noticed that the remove function was marked as
'__init' when it should really be marked as '__exit'.

Fixes: 46e2856b8e18 ("cpufreq: Add Kryo CPU scaling driver")
Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

v1 -> v2:

Add '__init' to qcom_cpufreq_kryo_probe instead of removing it from
qcom_cpufreq_kryo_get_msm_id.

v2 -> v3:

Go back to removing '__init' from qcom_cpufreq_kryo_get_msm_id instead
of adding '__init' to qcom_cpufreq_kryo_probe, which causes another
mismatch warning and add the '__init' -> '__exit' conversion noticed by
Nick.

The alternative solution is adding '__init' to qcom_cpufreq_kryo_probe,
removing the probe definition from qcom_cpufreq_kryo_driver, then
changing platform_driver_register to platform_driver_probe in
qcom_cpufreq_kryo_init, like [1]. I don't know how that would perform
given that I don't have a way to test this device.

[1]: https://lore.kernel.org/lkml/20180919185341.31298-1-natechancellor@gmail.com/

 drivers/cpufreq/qcom-cpufreq-kryo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
index a1830fa25fc5..2a3675c24032 100644
--- a/drivers/cpufreq/qcom-cpufreq-kryo.c
+++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
@@ -44,7 +44,7 @@ enum _msm8996_version {

 struct platform_device *cpufreq_dt_pdev, *kryo_cpufreq_pdev;

-static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void)
+static enum _msm8996_version qcom_cpufreq_kryo_get_msm_id(void)
 {
 	size_t len;
 	u32 *msm_id;
@@ -222,7 +222,7 @@ static int __init qcom_cpufreq_kryo_init(void)
 }
 module_init(qcom_cpufreq_kryo_init);

-static void __init qcom_cpufreq_kryo_exit(void)
+static void __exit qcom_cpufreq_kryo_exit(void)
 {
 	platform_device_unregister(kryo_cpufreq_pdev);
 	platform_driver_unregister(&qcom_cpufreq_kryo_driver);
-- 
2.19.0