From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH] PM / sleep: define inline functions
Date: Thu, 17 Dec 2015 02:43:38 +0100
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References: <1450266099-4352-1-git-send-email-sudipm.mukherjee@gmail.com> <87wpsdrjni.fsf@eliezer.anholt.net>
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To: Eric Anholt <eric@anholt.net>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>, Pavel Machek <pavel@ucw.cz>, Len Brown <len.brown@intel.com>, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org

On Wednesday, December 16, 2015 04:41:37 PM Eric Anholt wrote:
> 
> --=-=-=
> Content-Type: text/plain
> 
> Sudip Mukherjee <sudipm.mukherjee@gmail.com> writes:
> 
> > If CONFIG_PM_SLEEP is not defined then the functions are defined as
> > NULL. And as a result we are getting build failure with
> > alpha allmodconfig with the error:
> >
> > drivers/gpu/drm/vc4/vc4_v3d.c: In function 'vc4_v3d_set_power':
> > include/linux/stddef.h:7:14: error: called object is not a function or function pointer
> >  #define NULL ((void *)0)
> >               ^
> > include/linux/pm.h:776:30: note: in expansion of macro 'NULL'
> >  #define pm_generic_poweroff  NULL
> >                               ^
> > drivers/gpu/drm/vc4/vc4_v3d.c:157:10: note: in expansion of macro 'pm_generic_poweroff'
> >    return pm_generic_poweroff(&vc4->v3d->pdev->dev);
> >           ^
> > include/linux/stddef.h:7:14: error: called object is not a function or function pointer
> >  #define NULL ((void *)0)
> >               ^
> > include/linux/pm.h:764:28: note: in expansion of macro 'NULL'
> >  #define pm_generic_resume  NULL
> >                             ^
> > drivers/gpu/drm/vc4/vc4_v3d.c:159:10: note: in expansion of macro 'pm_generic_resume'
> >    return pm_generic_resume(&vc4->v3d->pdev->dev);
> >           ^
> >
> > Fixes: d5b1a78a772f ("drm/vc4: Add support for drawing 3D frames.")
> > Cc: Eric Anholt <eric@anholt.net>
> > Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
> 
> I'm happy with this solution, and would also be willing to just depend
> on the config option as well.  Whatever people prefer.

These functions are intended to be used as PM callbacks rather than to be
called directly from code that doesn't depend on PM_SLEEP, so I'd prefer
all code calling them directly to depend on the config option.

Thanks,
Rafael