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

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Message-id: <000001ce449c$3e1ce0f0$ba56a2d0$@samsung.com>
Date:	Mon, 29 Apr 2013 14:41:48 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	"'Rafael J. Wysocki'" <rjw@...k.pl>,
	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	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 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),
        },
 };

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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