linux-kernel - Re: [Update][PATCH 5/5] PM: Drop generic_subsys_pm

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Date:	Thu, 15 Dec 2011 23:47:43 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linux PM list <linux-pm@...r.kernel.org>
Cc:	"Greg Kroah-Hartman" <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Namhyung Kim <namhyung@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [Update][PATCH 5/5] PM: Drop generic_subsys_pm_ops

On Thursday, December 15, 2011, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Since the PM core is now going to execute driver callbacks directly
> if the corresponding subsystem callbacks are not present,
> forward-only subsystem callbacks (i.e. such that only execute the
> corresponding driver callbacks) are not necessary any more.  Thus
> it is possible to remove generic_subsys_pm_ops, because the only
> callback in there that is not forward-only, .runtime_idle, is not
> really used by the only user of generic_subsys_pm_ops, which is
> vio_bus_type.
> 
> However, the generic callback routines themselves cannot be removed
> from generic_ops.c, because they are used individually by a number
> of subsystems.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Well, Ben should have a look at this one too.  Now CCed.

Thanks,
Rafael


> ---
>  arch/powerpc/kernel/vio.c        |    1 -
>  drivers/base/power/generic_ops.c |   25 -------------------------
>  include/linux/pm.h               |   13 -------------
>  3 files changed, 39 deletions(-)
> 
> Index: linux/drivers/base/power/generic_ops.c
> ===================================================================
> --- linux.orig/drivers/base/power/generic_ops.c
> +++ linux/drivers/base/power/generic_ops.c
> @@ -302,28 +302,3 @@ void pm_generic_complete(struct device *
>  	pm_runtime_idle(dev);
>  }
>  #endif /* CONFIG_PM_SLEEP */
> -
> -struct dev_pm_ops generic_subsys_pm_ops = {
> -#ifdef CONFIG_PM_SLEEP
> -	.prepare = pm_generic_prepare,
> -	.suspend = pm_generic_suspend,
> -	.suspend_noirq = pm_generic_suspend_noirq,
> -	.resume = pm_generic_resume,
> -	.resume_noirq = pm_generic_resume_noirq,
> -	.freeze = pm_generic_freeze,
> -	.freeze_noirq = pm_generic_freeze_noirq,
> -	.thaw = pm_generic_thaw,
> -	.thaw_noirq = pm_generic_thaw_noirq,
> -	.poweroff = pm_generic_poweroff,
> -	.poweroff_noirq = pm_generic_poweroff_noirq,
> -	.restore = pm_generic_restore,
> -	.restore_noirq = pm_generic_restore_noirq,
> -	.complete = pm_generic_complete,
> -#endif
> -#ifdef CONFIG_PM_RUNTIME
> -	.runtime_suspend = pm_generic_runtime_suspend,
> -	.runtime_resume = pm_generic_runtime_resume,
> -	.runtime_idle = pm_generic_runtime_idle,
> -#endif
> -};
> -EXPORT_SYMBOL_GPL(generic_subsys_pm_ops);
> Index: linux/include/linux/pm.h
> ===================================================================
> --- linux.orig/include/linux/pm.h
> +++ linux/include/linux/pm.h
> @@ -300,19 +300,6 @@ const struct dev_pm_ops name = { \
>  	SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
>  }
>  
> -/*
> - * Use this for subsystems (bus types, device types, device classes) that don't
> - * need any special suspend/resume handling in addition to invoking the PM
> - * callbacks provided by device drivers supporting both the system sleep PM and
> - * runtime PM, make the pm member point to generic_subsys_pm_ops.
> - */
> -#ifdef CONFIG_PM
> -extern struct dev_pm_ops generic_subsys_pm_ops;
> -#define GENERIC_SUBSYS_PM_OPS	(&generic_subsys_pm_ops)
> -#else
> -#define GENERIC_SUBSYS_PM_OPS	NULL
> -#endif
> -
>  /**
>   * PM_EVENT_ messages
>   *
> Index: linux/arch/powerpc/kernel/vio.c
> ===================================================================
> --- linux.orig/arch/powerpc/kernel/vio.c
> +++ linux/arch/powerpc/kernel/vio.c
> @@ -1406,7 +1406,6 @@ static struct bus_type vio_bus_type = {
>  	.match = vio_bus_match,
>  	.probe = vio_bus_probe,
>  	.remove = vio_bus_remove,
> -	.pm = GENERIC_SUBSYS_PM_OPS,
>  };
>  
>  /**
> 
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