linux-kernel - Re: platform_bus: Allow runtime PM by default

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Message-ID: <20100423105750.GA27232@rakim.wolfsonmicro.main>
Date:	Fri, 23 Apr 2010 11:57:51 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Greg KH <greg@...ah.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org
Subject: Re: platform_bus: Allow runtime PM by default

On Thu, Apr 22, 2010 at 04:53:53PM -0700, Greg KH wrote:
> On Fri, Mar 26, 2010 at 05:42:50PM +0000, Mark Brown wrote:

> > Change the default implementation to the standard pm_generic_runtime
> > one, allowing drivers to use runtime PM without per-architecture
> > changes.

> That's nice, but it breaks the build on my system:
>   CC      drivers/base/platform.o
> drivers/base/platform.c: In function ‘platform_pm_runtime_suspend’:
> drivers/base/platform.c:970: error: implicit declaration of function ‘pm_generic_runtime_suspend’
> drivers/base/platform.c: In function ‘platform_pm_runtime_resume’:
> drivers/base/platform.c:975: error: implicit declaration of function ‘pm_generic_runtime_resume’
> drivers/base/platform.c: In function ‘platform_pm_runtime_idle’:
> drivers/base/platform.c:980: error: implicit declaration of function ‘pm_generic_runtime_idle’
> make[1]: *** [drivers/base/platform.o] Error 1
> make: *** [_module_drivers/base] Error 2

> Care to fix it up?

This depends on "PM: Provide generic subsystem-level callbacks" which is
in Linus' tree - which kernel version are you building against and with
what config?  Things work fine for me in -next...
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