From 1c7d67073e2d196597f541351bc9b109c8a93528 Mon Sep 17 00:00:00 2001
From: Jack Steiner <steiner@sgi.com>
Date: Thu, 31 Aug 2006 11:34:47 -0500
Subject: [IA64] Save register stack contents on cpu start

The SN PROM uses the register stack in the slave loop. The contents
must be preserved for the OS to return to the slave loop via offlining
a cpu or for kexec. A 'flushrs" is needed to force the stack to be written
to memory prior to changing bspstore.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index 29236f0..44d540e 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -197,6 +197,11 @@ start_ap:
 	;;
 	srlz.i
 	;;
+ {
+	flushrs				// must be first insn in group
+	srlz.i
+ }
+	;;
 	/*
 	 * Save the region registers, predicate before they get clobbered
 	 */
-- 
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