From faa4cfa6b334fc07c3386e620a2fb55de508c077 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Bj=C3=B6rn=20Steinbrink?= <B.Steinbrink@gmx.de>
Date: Sat, 16 Jun 2007 10:15:55 -0700
Subject: [PATCH] i386: fix NMI watchdog not reserving its MSRs
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At system boot time, the NMI watchdog no longer reserved its MSRs, allowing
other subsystems to mess with them.  Fix that.

Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/i386/kernel/cpu/perfctr-watchdog.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/i386/kernel/cpu/perfctr-watchdog.c b/arch/i386/kernel/cpu/perfctr-watchdog.c
index 2b04c8f1db..8343244b72 100644
--- a/arch/i386/kernel/cpu/perfctr-watchdog.c
+++ b/arch/i386/kernel/cpu/perfctr-watchdog.c
@@ -614,6 +614,12 @@ int lapic_watchdog_init(unsigned nmi_hz)
 		probe_nmi_watchdog();
 		if (!wd_ops)
 			return -1;
+
+		if (!wd_ops->reserve()) {
+			printk(KERN_ERR
+				"NMI watchdog: cannot reserve perfctrs\n");
+			return -1;
+		}
 	}
 
 	if (!(wd_ops->setup(nmi_hz))) {
-- 
2.39.5