From c429886a7091f9d26dee7d01c20fd822f62c35e0 Mon Sep 17 00:00:00 2001
From: Graf Yang <graf.yang@analog.com>
Date: Wed, 17 Mar 2010 09:00:32 +0000
Subject: [PATCH] Blackfin: allow NMI watchdog to be used w/RETN as a scratch
 reg

NMIs are not safe to return from because many anomaly workarounds are
implemented by disabling interrupts.  The NMI obviously violates this
assumption.  Since the NMI watchdog never returns, we don't have to
worry about it clobbering RETN when it is being used as a scratch register
with the exception stack.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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