From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: broken nouveau dependency on power supply
Date: Mon, 02 Apr 2012 11:06:02 +1000
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Hi folks !

With CONFIG_POWER_SUPPLY=m & nouveau built-in we get a build failure:

drivers/built-in.o: In function `.nouveau_pm_trigger':
(.text+0xa56e8): undefined reference to `.power_supply_is_system_supplied'

nouveau probably needs to depends on CONFIG_POWER_SUPPLY to force a module
build with the latter is =m

Cheers,
Ben.