From 01e8ec4417d3c484986af0adaa0ae6632e0a59cd Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 16 Mar 2012 09:26:59 +1100
Subject: [PATCH] powerpc: Fix power4/970 idle code regression with lockdep

in commit 7230c5644188cd9e3fb380cc97dde00c464a3ba7
"powerpc: Rework lazy-interrupt handling"

I introduced a regression, accidentally calling irq tracing twice
and not properly restoring a clobbered register (r7) later used
for writing to the MSR.

This caused lockups when booting on a G5 with lockdep enabled.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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