linux-kernel - Re: [RFC PATCH 3/3] mmc: jz4740: Use pm_sleep

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Date:   Thu, 20 Feb 2020 14:42:52 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:     Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        od@...c.me, Linux PM <linux-pm@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/3] mmc: jz4740: Use pm_sleep_ptr() macro

On Thu, 20 Feb 2020 at 14:38, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Tue, 11 Feb 2020 at 17:03, Paul Cercueil <paul@...pouillou.net> wrote:
> >
> > Use the newly introduced pm_sleep_ptr() macro to simplify the code.
> >
> > Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> > ---
> >  drivers/mmc/host/jz4740_mmc.c | 12 +++---------
> >  1 file changed, 3 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c
> > index fbae87d1f017..09554f9831de 100644
> > --- a/drivers/mmc/host/jz4740_mmc.c
> > +++ b/drivers/mmc/host/jz4740_mmc.c
> > @@ -1099,24 +1099,18 @@ static int jz4740_mmc_remove(struct platform_device *pdev)
> >         return 0;
> >  }
> >
> > -#ifdef CONFIG_PM_SLEEP
> > -
> > -static int jz4740_mmc_suspend(struct device *dev)
> > +static int __maybe_unused jz4740_mmc_suspend(struct device *dev)
> >  {
> >         return pinctrl_pm_select_sleep_state(dev);
> >  }
> >
> > -static int jz4740_mmc_resume(struct device *dev)
> > +static int __maybe_unused jz4740_mmc_resume(struct device *dev)
> >  {
> >         return pinctrl_select_default_state(dev);
> >  }
> >
> >  static SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
> >         jz4740_mmc_resume);
> > -#define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
> > -#else
> > -#define JZ4740_MMC_PM_OPS NULL
> > -#endif
>
> All of the above code can be simplified in this way, without having to
> convert into using the new pm_sleep_ptr() macro, below.
>
> The only "penalty" would be that, the struct dev_pm_ops
> (jz4740_mmc_pm_ops) would then be referenced even when CONFIG_PM* is
> unset, thus the compiler would be able to throw it away.

/s/would/would not

[...]

Kind regards
Uffe