Re: [RFC/PATCH 1/3] pm: make PM macros more smart

[Pavel Machek]

On Thu 2013-12-12 21:18:23, David Cohen wrote:
> This patch makes SET_SYSTEM_SLEEP_PM_OPS() and SET_RUNTIME_PM_OPS() more
> smart.
> 
> Despite those macros check for '#ifdef CONFIG_PM_SLEEP/RUNTIME' to avoid
> setting the callbacks when such #ifdef's aren't defined, they don't
> handle compiler to avoid messages like that:
> 
> drivers/usb/host/xhci-plat.c:200:12: warning: ???xhci_plat_suspend??? defined but not used [-Wunused-function]
> drivers/usb/host/xhci-plat.c:208:12: warning: ???xhci_plat_resume??? defined but not used [-Wunused-function]
> 
> As result, those macros get rid of #ifdef's when setting callbacks but
> not when implementing them.
> 
> With this patch, drivers using SET_*_PM_OPS() macros don't need to #ifdef
> the callbacks implementation as well.

Well... Interesting trickery, but it means that resulting kernel
will be bigge due to the dead functions no?

That may be acceptable tradeoff, but I guess its worth discussing...
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