On Fri, Dec 4, 2020 at 11:02 AM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> On Thu, 3 Dec 2020 at 23:29, Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
> > -#ifdef CONFIG_PM
> > static void msdc_save_reg(struct msdc_host *host)
>
> Shouldn't msdc_save|restore_reg() be turned into "__maybe_unused" as well?
There is no need since the compiler can figure that out already when there
is a reference to the function from dead code.
> >
> > -static int msdc_resume(struct device *dev)
> > +static int __maybe_unused msdc_resume(struct device *dev)
> > {
> > return pm_runtime_force_resume(dev);
> > }
> > -#endif
> >
> > static const struct dev_pm_ops msdc_dev_pm_ops = {
>
> You may also change this to a __maybe_unused, as long as you also
> assign the .pm pointer in the mt_msdc_driver with
> pm_ptr(&msdc_dev_pm_ops).
>
> Ideally the compiler should drop these functions/datas entirely then.
I don't see a lot of other instances of that yet, and it's fairly new.
Maybe we should fix it before it gets propagated further.
I would suggest we redefine pm_ptr like
#define pm_ptr(_ptr) (IS_ENABLED(CONFIG_PM) ? (_ptr) : NULL)
and remove the __maybe_unused annotations on those that we
already have. This also has the effect of dropping the unused
data from the object, but without having to an an #ifdef or
__maybe_unused.
Adding Paul and Rafael to Cc for clarification on this.
Arnd
