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

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Date:	Mon, 29 Apr 2013 14:12:56 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Jingoo Han <jg1.han@...sung.com>
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
Subject: Re: [PATCH] PM: Add pm_ops_ptr() macro

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?

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