linux-kernel - Re: [PATCH] PM: Add pm_ops

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Message-id: <000101ce453d$39611b70$ac235250$@samsung.com>
Date:	Tue, 30 Apr 2013 09:54:09 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Lars-Peter Clausen' <lars@...afoo.de>
Cc:	"'Rafael J. Wysocki'" <rjw@...k.pl>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, 'Len Brown' <len.brown@...el.com>,
	'Pavel Machek' <pavel@....cz>, linux-pm@...r.kernel.org,
	Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH] PM: Add pm_ops_ptr() macro

On Monday, April 29, 2013 9:13 PM, Lars-Peter Clausen wrote:
> On 04/29/2013 07:41 AM, Jingoo Han wrote:
> > On Saturday, April 27, 2013 11:41 PM, Rafael J. Wysocki:
> >>
> >> On Saturday, April 27, 2013 11:54:50 AM Jingoo Han wrote:
> >>> Add pm_ops_ptr() macro that allows the .pm entry in the driver structures
> >>> to be assigned without having an #define xxx NULL for the case that PM is
> >>> not enabled.
> >>>
> >>> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> >>
> >> First, I'm not taking any more PM patches for v3.10 (that don't fix recent
> >> regressions).
> >>
> >> Second, please add that macro along with a user.
> >
> > Hi Rafael,
> >
> > This macro can be used as below:
> > This macro cannot affect the procedure of suspend/resume
> > calls; thus, there is no side effect.
> > It just reduces the code size of each drivers.
> > In this way, of_match_ptr() macro has been already used.
> >
> >
> > --- a/drivers/i2c/busses/i2c-s3c2410.c
> > +++ b/drivers/i2c/busses/i2c-s3c2410.c
> > @@ -1218,7 +1218,6 @@ static int s3c24xx_i2c_resume(struct device *dev)
> >  }
> >  #endif
> >
> > -#ifdef CONFIG_PM
> >  static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
> >  #ifdef CONFIG_PM_SLEEP
> >         .suspend_noirq = s3c24xx_i2c_suspend_noirq,
> > @@ -1226,11 +1225,6 @@ static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
> >  #endif
> >  };
> >
> > -#define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops)
> > -#else
> > -#define S3C24XX_DEV_PM_OPS NULL
> > -#endif
> > -
> >  /* device driver for platform bus bits */
> >
> >  static struct platform_driver s3c24xx_i2c_driver = {
> > @@ -1240,7 +1234,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
> >         .driver         = {
> >                 .owner  = THIS_MODULE,
> >                 .name   = "s3c-i2c",
> > -               .pm     = S3C24XX_DEV_PM_OPS,
> > +               .pm     = pm_ops_ptr(&s3c24xx_i2c_dev_pm_ops),
> >                 .of_match_table = of_match_ptr(s3c24xx_i2c_match),
> >         },
> >  };
> 
> Won't that generate a warning about an unused s3c24xx_i2c_dev_pm_ops when
> CONFIG_PM is not enabled?

No, there is no build warning, when CONFIG_PM is not enabled.
In this way, of_match_ptr() macro has been already used
without build warnings.


Best regards,
Jingoo Han


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