linux-kernel - RE: [tpmdd-devel] [PATCH] tpm/tpm_crb: fix unused warnings on suspend/resume functions

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Message-ID: <5B8DA87D05A7694D9FA63FD143655C1B543B122D@hasmsx108.ger.corp.intel.com>
Date:   Tue, 21 Mar 2017 22:05:36 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jérémy Lefaure <jeremy.lefaure@....epita.fr>
CC:     "tpmdd-devel@...ts.sourceforge.net" 
        <tpmdd-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "arnd@...db.de" <arnd@...db.de>
Subject: RE: [tpmdd-devel] [PATCH] tpm/tpm_crb: fix unused warnings on
 suspend/resume functions

> On Thu, Mar 16, 2017 at 09:51:33PM -0400, Jérémy Lefaure wrote:
> > When PM_SLEEP is disabled crb_pm_suspend and crb_pm_resume are not
> > used by SET_SYSTEM_SLEEP_PM_OPS even if PM is enabled:
> >
> > drvers/char/tpm/tpm_crb.c:540:12: warning: ‘crb_pm_suspend’ defined
> > but not used [-Wunused-function]  static int crb_pm_suspend(struct
> > device *dev)
> >             ^
> > drivers/char/tpm/tpm_crb.c:551:12: warning: ‘crb_pm_resume’ defined
> > but not used [-Wunused-function]  static int crb_pm_resume(struct
> > device *dev)
> >             ^
> >
> > The preprocessor condition should be on CONFIG_PM_SLEEP, not on
> CONFIG_PM.
> > However, this patch fixes this warning by using __maybe_unused on
> > function that are in the preprocessor condition.
> >
> > Signed-off-by: Jérémy Lefaure <jeremy.lefaure@....epita.fr>
> 
> Thanks. Please include also linux-kernel@...r.kernel.org in the future.
> 
> Reviewed-by: Jarkko Saskkinen <jarkko.sakkinen@...ux.intel.com>

We should go with Arnd's patch, which is actually the same,  but it was already reviewed and has better commit messages.
Thanks
Tomas


> > ---
> >  drivers/char/tpm/tpm_crb.c | 11 ++++-------
> >  1 file changed, 4 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> > index 324561845dc2..044afb73fdeb 100644
> > --- a/drivers/char/tpm/tpm_crb.c
> > +++ b/drivers/char/tpm/tpm_crb.c
> > @@ -520,8 +520,7 @@ static int crb_acpi_remove(struct acpi_device
> *device)
> >  	return 0;
> >  }
> >
> > -#ifdef CONFIG_PM
> > -static int crb_pm_runtime_suspend(struct device *dev)
> > +static int __maybe_unused crb_pm_runtime_suspend(struct device *dev)
> >  {
> >  	struct tpm_chip *chip = dev_get_drvdata(dev);
> >  	struct crb_priv *priv = dev_get_drvdata(&chip->dev); @@ -529,7
> > +528,7 @@ static int crb_pm_runtime_suspend(struct device *dev)
> >  	return crb_go_idle(dev, priv);
> >  }
> >
> > -static int crb_pm_runtime_resume(struct device *dev)
> > +static int __maybe_unused crb_pm_runtime_resume(struct device *dev)
> >  {
> >  	struct tpm_chip *chip = dev_get_drvdata(dev);
> >  	struct crb_priv *priv = dev_get_drvdata(&chip->dev); @@ -537,7
> > +536,7 @@ static int crb_pm_runtime_resume(struct device *dev)
> >  	return crb_cmd_ready(dev, priv);
> >  }
> >
> > -static int crb_pm_suspend(struct device *dev)
> > +static int __maybe_unused crb_pm_suspend(struct device *dev)
> >  {
> >  	int ret;
> >
> > @@ -548,7 +547,7 @@ static int crb_pm_suspend(struct device *dev)
> >  	return crb_pm_runtime_suspend(dev);
> >  }
> >
> > -static int crb_pm_resume(struct device *dev)
> > +static int __maybe_unused crb_pm_resume(struct device *dev)
> >  {
> >  	int ret;
> >
> > @@ -559,8 +558,6 @@ static int crb_pm_resume(struct device *dev)
> >  	return tpm_pm_resume(dev);
> >  }
> >
> > -#endif /* CONFIG_PM */
> > -
> >  static const struct dev_pm_ops crb_pm = {
> >  	SET_SYSTEM_SLEEP_PM_OPS(crb_pm_suspend, crb_pm_resume)
> >  	SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend,
> crb_pm_runtime_resume,
> > NULL)
> > --
> > 2.12.0
> >
> 
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