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

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Message-ID: <2369076.UqXRQJTAqK@vostro.rjw.lan>
Date:	Mon, 29 Apr 2013 13:35:05 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	'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
Subject: Re: [PATCH] PM: Add pm_ops_ptr() macro

On Monday, April 29, 2013 02:41:48 PM 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.

OK, so care to fold the below into your original patch?

Rafael


> --- 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),
>         },
>  };
> 
> Best regards,
> Jingoo Han
> 
> 
> > 
> > Thanks,
> > Rafael
> > 
> > 
> > > ---
> > >  include/linux/pm.h |    2 ++
> > >  1 files changed, 2 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/include/linux/pm.h b/include/linux/pm.h
> > > index a224c7f..bd50d15 100644
> > > --- a/include/linux/pm.h
> > > +++ b/include/linux/pm.h
> > > @@ -55,8 +55,10 @@ struct device;
> > >
> > >  #ifdef CONFIG_PM
> > >  extern const char power_group_name[];		/* = "power" */
> > > +#define pm_ops_ptr(_ptr)	(_ptr)
> > >  #else
> > >  #define power_group_name	NULL
> > > +#define pm_ops_ptr(_ptr)	NULL
> > >  #endif
> > >
> > >  typedef struct pm_message {
> > >
> > --
> > I speak only for myself.
> > Rafael J. Wysocki, Intel Open Source Technology Center.
> 
> --
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-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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