linux-kernel - Re: [PATCH 1/2] i386: Fix NMI watchdog not reserving its MSRs

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Message-ID: <20070608184650.GB2204@atjola.homenet>
Date:	Fri, 8 Jun 2007 20:46:50 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Udo A. Steinberg" <us15@...inf.tu-dresden.de>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, ak@...e.de
Subject: Re: [PATCH 1/2] i386: Fix NMI watchdog not reserving its MSRs

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@....de>
---
diff --git a/arch/i386/kernel/cpu/perfctr-watchdog.c b/arch/i386/kernel/cpu/perfctr-watchdog.c
index 2b04c8f..f0b6763 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))) {
-
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