From: Martin Hicks <mort@sgi.com>
Date: Fri, 30 Jan 2009 16:50:54 +0000 (-0600)
Subject: x86: push old stack address on irqstack for unwinder
X-Git-Tag: v2.6.29-rc4~50^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a67798cd7bb130bf37f5ffb28f3260f4c10232db;p=pandora-kernel.git

x86: push old stack address on irqstack for unwinder

Impact: Fixes dumpstack and KDB on 64 bits

This re-adds the old stack pointer to the top of the irqstack to help
with unwinding.  It was removed in commit d99015b1abbad743aa049b439c1e1dede6d0fa49
as part of the save_args out-of-line work.

Both dumpstack and KDB require this information.

Signed-off-by: Martin Hicks <mort@sgi.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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