linux-kernel - Re: [PATCH 2/3] PM: define new ASSIGN_*_PM_OPS macros based on assign

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Date:	Sat, 1 Mar 2014 12:06:33 +0100
From:	Pavel Machek <pavel@....cz>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Josh Cartwright <joshc@...eaurora.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] PM: define new ASSIGN_*_PM_OPS macros based on
 assign_if

Hi!

> > +#define ASSIGN_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> > +	.suspend = assign_if_pm_sleep(suspend_fn), \
> > +	.resume = assign_if_pm_sleep(resume_fn), \
> > +	.freeze = assign_if_pm_sleep(suspend_fn), \
> > +	.thaw = assign_if_pm_sleep(resume_fn), \
> > +	.poweroff = assign_if_pm_sleep(suspend_fn), \
> > +	.restore = assign_if_pm_sleep(resume_fn),
> 
> Ugh, what a mess, really?  Is it that hard to get the #ifdef right in
> the code?  Why not just always define the functions and then also always
> have them in the structures, and if the feature isn't enabled, just
> don't call/use them?

The functions may not compile with CONFIG_PM disabled. (And #ifdefs in
the code are considered ugly).

> Yes, it would cause a _very_ tiny increase in code size if the option is
> disabled, but really, does anyone ever disable those options becides on
> the dreaded 'make randconfig' checkers?

We don't want CONFIG_PM complexity on some embedded systems... and it
is useful tostart with simple (!PM) system when introducing new board.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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