drivers: thermal: processor_thermal: mark pm function __maybe_unused

Message ID 20190708124743.3585020-1-arnd@arndb.de
State New
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  • drivers: thermal: processor_thermal: mark pm function __maybe_unused
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Commit Message

Arnd Bergmann July 8, 2019, 12:47 p.m.
Without CONFIG_PM, we get a harmless warning:

drivers/thermal/intel/int340x_thermal/processor_thermal_device.c:446:12: error: 'proc_thermal_resume' defined but not used [-Werror=unused-function]
 static int proc_thermal_resume(struct device *dev)

Mark it __maybe_unused to shut up the warning.

Fixes: aaba9791fbb4 ("drivers: thermal: processor_thermal: Read PPCC on resume")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

---
 .../thermal/intel/int340x_thermal/processor_thermal_device.c    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.20.0

Comments

Zhang Rui July 10, 2019, 1:34 p.m. | #1
Hi, Arnd,

thanks for the report.

On 一, 2019-07-08 at 14:47 +0200, Arnd Bergmann wrote:
> Without CONFIG_PM, we get a harmless warning:

> 

> drivers/thermal/intel/int340x_thermal/processor_thermal_device.c:446:

> 12: error: 'proc_thermal_resume' defined but not used [-

> Werror=unused-function]

>  static int proc_thermal_resume(struct device *dev)

> 

> Mark it __maybe_unused to shut up the warning.

> 

> Fixes: aaba9791fbb4 ("drivers: thermal: processor_thermal: Read PPCC

> on resume")

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

> ---

>  .../thermal/intel/int340x_thermal/processor_thermal_device.c    | 2

> +-

>  1 file changed, 1 insertion(+), 1 deletion(-)

> 

> diff --git

> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c

> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c

> index a3210f09f366..5ce639a99330 100644

> ---

> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c

> +++

> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c

> @@ -443,7 +443,7 @@ static void  proc_thermal_pci_remove(struct

> pci_dev *pdev)

>  	pci_disable_device(pdev);

>  }

>  

> -static int proc_thermal_resume(struct device *dev)

> +static int __maybe_unused proc_thermal_resume(struct device *dev)

>  {

>  	struct proc_thermal_device *proc_dev;

>  

I'd rather prefer to add #ifdef CONFIG_PM_SLEEP for
proc_thermal_resume().
Just like the patch below, what do you think?

thanks,
rui

From 6c395f66e98c895cf3ebf87c0b2fc63b6a57a196 Mon Sep 17 00:00:00 2001
From: Zhang Rui <rui.zhang@intel.com>

Date: Tue, 9 Jul 2019 21:19:12 +0800
Subject: [PATCH] drivers: thermal: processor_thermal_device: Fix build warning

As a system sleep callback, proc_thermal_resume() should be defined only
if CONFIG_PM_SLEEP is set.

This fixes a build warning when CONFIG_PM_SLEEP is not set,
drivers/thermal/intel/int340x_thermal/processor_thermal_device.c:446:12: error: 'proc_thermal_resume' defined but not used [-Werror=unused-function]
 static int proc_thermal_resume(struct device *dev)

Fixes: aaba9791fbb4 ("drivers: thermal: processor_thermal: Read PPCC on resume")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

---
 drivers/thermal/intel/int340x_thermal/processor_thermal_device.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
index a3210f0..77dae1e 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
@@ -443,6 +443,7 @@ static void  proc_thermal_pci_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+#ifdef CONFIG_PM_SLEEP
 static int proc_thermal_resume(struct device *dev)
 {
 	struct proc_thermal_device *proc_dev;
@@ -452,6 +453,9 @@ static int proc_thermal_resume(struct device *dev)
 
 	return 0;
 }
+#else
+#define proc_thermal_resume NULL
+#endif
 
 static SIMPLE_DEV_PM_OPS(proc_thermal_pm, NULL, proc_thermal_resume);
 
-- 
2.7.4

Patch

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
index a3210f09f366..5ce639a99330 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
@@ -443,7 +443,7 @@  static void  proc_thermal_pci_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
-static int proc_thermal_resume(struct device *dev)
+static int __maybe_unused proc_thermal_resume(struct device *dev)
 {
 	struct proc_thermal_device *proc_dev;