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Date: Fri, 21 Jan 2011 12:13:53 +0000
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Kim Kyuwon <q1.kim@samsung.com>, Kim Kyuwon <chammoru@gmail.com>,
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Subject: Re: [PATCH] leds: Convert bd2802 driver to dev_pm_ops
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On Thu, Jan 20, 2011 at 03:35:28PM -0800, Andrew Morton wrote:

> It's tricky to get the compiler/linker to discard code and data without
> triggering an unused-var warning.  cpu_notifier() does it by emitting a
> reference:

SIMPLE_DEV_PM_OPS() is being a bit more brute force than that - it
just defines out the reference if compiled without PM_SLEEP.  You still
need the ifdefs around the function definitions, but not their uses.