From 1676193937a538fdb92a2916a86a705093cfd613 Mon Sep 17 00:00:00 2001
From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Date: Tue, 13 Feb 2007 13:26:22 +0100
Subject: [PATCH] [PATCH] x86-64: Handle 32 bit PerfMon Counter writes cleanly
 in x86_64 nmi_watchdog

P6 CPUs and Core/Core 2 CPUs which has 'architectural perf mon' feature,
only supports write of low 32 bits in Performance Monitoring Counters.
Bits 32..39 are sign extended based on bit 31 and bits 40..63 are reserved
and should be zero.

This patch:

Change x86_64 nmi handler to handle this case cleanly.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
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