Hi Arnd,
On Mon, 2022-11-14 at 08:33 +0100, Arnd Bergmann wrote:
> On Mon, Nov 14, 2022, at 08:17, Stephen Rothwell wrote:
> > Hi all,
> >
> > After merging the char-misc tree, today's linux-next build (powerpc
> > allnoconfig) produced these warnings:
> >
> > drivers/bus/simple-pm-bus.c:96:12: warning:
> > 'simple_pm_bus_runtime_resume' defined but not used [-Wunused-function]
> > 96 | static int simple_pm_bus_runtime_resume(struct device *dev)
> > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > drivers/bus/simple-pm-bus.c:87:12: warning:
> > 'simple_pm_bus_runtime_suspend' defined but not used [-Wunused-function]
> > 87 | static int simple_pm_bus_runtime_suspend(struct device *dev)
> > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Introduced by commit
> >
> > 882cf4c913d7 ("drivers: bus: simple-pm-bus: Use clocks")
>
> I see that this is caused by the patch using the old-style
> SET_RUNTIME_PM_OPS/SET_NOIRQ_SYSTEM_SLEEP_PM_OPS macros
> instead of the correct SYSTEM_SLEEP_PM_OPS/NOIRQ_SYSTEM_SLEEP_PM_OPS
> versions.
>
You meant RUNTIME_PM_OPS/NOIRQ_SYSTEM_SLEEP_PM_OPS macros should be
used, right?
Why not add __maybe_unused to the callbacks like below snippet instead?
This way, the old-style macros may determine those callbacks are NULL
or non-NULL according to CONFIG_PM_SLEEP and CONFIG_PM.
-------------------------------8<-------------------------------------
--- a/drivers/bus/simple-pm-bus.c
+++ b/drivers/bus/simple-pm-bus.c
@@ -84,7 +84,7 @@ static int simple_pm_bus_remove(struct
platform_device *pdev)
return 0;
}
-static int simple_pm_bus_runtime_suspend(struct device *dev)
+static int __maybe_unused simple_pm_bus_runtime_suspend(struct device
*dev)
{
struct simple_pm_bus *bus = dev_get_drvdata(dev);
@@ -93,7 +93,7 @@ static int simple_pm_bus_runtime_suspend(struct
device *dev)
return 0;
}
-static int simple_pm_bus_runtime_resume(struct device *dev)
+static int __maybe_unused simple_pm_bus_runtime_resume(struct device
*dev)
{
struct simple_pm_bus *bus = dev_get_drvdata(dev);
int ret;
-------------------------------8<-------------------------------------
Regards,
Liu Ying
