From 4bfaaef01a1badb9e8ffb0c0a37cd2379008d21f Mon Sep 17 00:00:00 2001
From: Magnus Damm <magnus@valinux.co.jp>
Date: Tue, 26 Sep 2006 10:52:38 +0200
Subject: [PATCH] [PATCH] Avoid overwriting the current pgd (V4, x86_64)

kexec: Avoid overwriting the current pgd (V4, x86_64)

This patch upgrades the x86_64-specific kexec code to avoid overwriting the
current pgd. Overwriting the current pgd is bad when CONFIG_CRASH_DUMP is used
to start a secondary kernel that dumps the memory of the previous kernel.

The code introduces a new set of page tables. These tables are used to provide
an executable identity mapping without overwriting the current pgd.

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>
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