From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH v4 19/21] drivers/of: Support adding sub-tree
Date: Thu, 14 May 2015 17:29:04 +1000
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Cc: Rob Herring <robherring2@gmail.com>, Gavin Shan <gwshan@linux.vnet.ibm.com>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, Grant Likely <grant.likely@linaro.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
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> So I would have to do a special case on unplug:
> 
> 	if (slot->dt_is_overlay) /* set to false at boot */
> 		remove_subtree_myself();
> 	else
> 		undo_overlay(slot->overlay);

Of course I just inverted the polarity of the if () in the example :-)

But you get the idea...