linux-kernel - Re: [PATCH] mmc: sdhci-esdhc-imx: avoid unused function warnings

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Message-ID: <19008164.GYnbEcydYS@wuerfel>
Date:	Tue, 26 Jul 2016 22:56:07 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Dong Aisheng <aisheng.dong@....com>,
	Haibo Chen <haibo.chen@...escale.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: avoid unused function warnings

On Tuesday, July 26, 2016 10:18:53 PM CEST Ulf Hansson wrote:
> > diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> > index 2bb326bbc34a..593e34053c4b 100644
> > --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> > +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> > @@ -1293,13 +1293,12 @@ static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
> >         return 0;
> >  }
> >
> > -#ifdef CONFIG_PM
> > -static int sdhci_esdhc_suspend(struct device *dev)
> > +static int __maybe_unused sdhci_esdhc_suspend(struct device *dev)
> 
> Instead of using __maybe_unused, I prefer to change above "#ifdef
> CONFIG_PMf" to "#ifdef CONFIG_PM_SLEEP".
> I do realize that the runtime PM callbacks still requires #ifdef
> CONFIG_PM, so yes that's requires an extra "ifdef".
> 
> Sure, it's more a matter of taste (and micro optimizations).

I was hoping that we could eventually do a mass-conversion to
__maybe_unused, as everybody seems to get the #ifdef wrong.

Any specific reason for your preference?

	Arnd