From: Jack Steiner <steiner@sgi.com>
Date: Thu, 31 Aug 2006 16:34:47 +0000 (-0500)
Subject: [IA64] Save register stack contents on cpu start
X-Git-Tag: v2.6.18-rc7~15
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c7d67073e2d196597f541351bc9b109c8a93528;p=linux-2.6

[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 29236f0c62..44d540efa6 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
 	 */