linux-kernel - Re: [PATCH] mfd: cs42l43: fix defined but not used warnings

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Message-ID: <20230925075620.GC9999@google.com>
Date:   Mon, 25 Sep 2023 08:56:20 +0100
From:   Lee Jones <lee@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     zhangshida <starzhangzsd@...il.com>, linux-kernel@...r.kernel.org,
        zhangshida@...inos.cn, k2ci <kernel-bot@...inos.cn>
Subject: Re: [PATCH] mfd: cs42l43: fix defined but not used warnings

On Fri, 22 Sep 2023, Geert Uytterhoeven wrote:

> Hi Lee,
> 
> On Wed, Sep 20, 2023 at 12:07 PM Lee Jones <lee@...nel.org> wrote:
> > On Tue, 05 Sep 2023, zhangshida wrote:
> > > From: Shida Zhang <zhangshida@...inos.cn>
> > >
> > > Warnings were generated during compiling for functions like
> > > cs42l43_*_{resume,suspend}:
> > >
> > > ../drivers/mfd/cs42l43.c:1138:12: error: ‘cs42l43_runtime_resume’ defined but not used [-Werror=unused-function]
> > >  1138 | static int cs42l43_runtime_resume(struct device *dev)
> > >       |            ^~~~~~~~~~~~~~~~~~~~~~
> > > ../drivers/mfd/cs42l43.c:1124:12: error: ‘cs42l43_runtime_suspend’ defined but not used [-Werror=unused-function]
> > >  1124 | static int cs42l43_runtime_suspend(struct device *dev)
> > >       |            ^~~~~~~~~~~~~~~~~~~~~~~
> > > ../drivers/mfd/cs42l43.c:1106:12: error: ‘cs42l43_resume’ defined but not used [-Werror=unused-function]
> > >  1106 | static int cs42l43_resume(struct device *dev)
> > >       |            ^~~~~~~~~~~~~~
> > > ../drivers/mfd/cs42l43.c:1076:12: error: ‘cs42l43_suspend’ defined but not used [-Werror=unused-function]
> > >  1076 | static int cs42l43_suspend(struct device *dev)
> > >
> > > Fix it by guarding it with CONFIG_PM/CONFIG_PM_SLEEP.
> > >
> > > Reported-by: k2ci <kernel-bot@...inos.cn>
> > > Signed-off-by: Shida Zhang <zhangshida@...inos.cn>
> > > ---
> > >  drivers/mfd/cs42l43.c | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/drivers/mfd/cs42l43.c b/drivers/mfd/cs42l43.c
> > > index 37b23e9bae82..e589a61c118d 100644
> > > --- a/drivers/mfd/cs42l43.c
> > > +++ b/drivers/mfd/cs42l43.c
> > > @@ -1073,6 +1073,7 @@ void cs42l43_dev_remove(struct cs42l43 *cs42l43)
> > >  }
> > >  EXPORT_SYMBOL_NS_GPL(cs42l43_dev_remove, MFD_CS42L43);
> > >
> > > +#ifdef CONFIG_PM_SLEEP
> > >  static int cs42l43_suspend(struct device *dev)
> > >  {
> > >       struct cs42l43 *cs42l43 = dev_get_drvdata(dev);
> > > @@ -1120,7 +1121,9 @@ static int cs42l43_resume(struct device *dev)
> > >
> > >       return 0;
> > >  }
> > > +#endif
> > >
> > > +#ifdef CONFIG_PM
> > >  static int cs42l43_runtime_suspend(struct device *dev)
> > >  {
> > >       struct cs42l43 *cs42l43 = dev_get_drvdata(dev);
> > > @@ -1176,6 +1179,7 @@ static int cs42l43_runtime_resume(struct device *dev)
> > >
> > >       return ret;
> > >  }
> > > +#endif
> > >
> > >  EXPORT_NS_GPL_DEV_PM_OPS(cs42l43_pm_ops, MFD_CS42L43) = {
> > >       SET_SYSTEM_SLEEP_PM_OPS(cs42l43_suspend, cs42l43_resume)
> >
> > I see a bunch of drivers using PM helpers and not many of them are
> > are being guarded by ugly #ifery.  Please find out what they're doing to
> > solve the same issue and replicate that instead.
> >
> > Here's a really big hint:
> >
> >   `git log --oneline 02313a90095fb`
> 
> And there's no need to create another fix, as a Good Old fix is
> available (and still not upstream):
> https://lore.kernel.org/all/20230822114914.340359-1-ckeepax@opensource.cirrus.com

I beg to differ;

  eb72d5207008d ("mfd: cs42l43: Use correct macro for new-style PM runtime ops")

:)

-- 
Lee Jones [李琼斯]