From 30a6ecad9670d97c9d0fbfa7d80970aeb339bdec Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 31 Jan 2006 18:35:05 -0800
Subject: [PATCH] [SPARC64]: Don't clobber alt-global %g4 on window fixups.

If we are returning back to kernel mode, %g4 could be live
(for example, in the case where we window spill in the etrap
code).  So do not change it's value if going back to kernel.

Signed-off-by: David S. Miller <davem@davemloft.net>
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