linux-kernel - [PATCH] [8/9] x86: CMCI: Disable CMCI on rebooting

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Message-Id: <20090212124937.6095D3E666D@basil.firstfloor.org>
Date:	Thu, 12 Feb 2009 13:49:37 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	akpm@...ux-foundation.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org
Subject: [PATCH] [8/9] x86: CMCI: Disable CMCI on rebooting


Disable the CMCI vector on reboot to avoid confusing other OS.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 arch/x86/kernel/apic.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux/arch/x86/kernel/apic.c
===================================================================
--- linux.orig/arch/x86/kernel/apic.c	2009-02-12 12:02:27.000000000 +0100
+++ linux/arch/x86/kernel/apic.c	2009-02-12 12:10:16.000000000 +0100
@@ -868,6 +868,14 @@
 		apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
 	}
 #endif
+#ifdef CONFIG_X86_MCE_INTEL
+	if (maxlvt >= 6) {
+		v = apic_read(APIC_LVTCMCI);
+		if (!(v & APIC_LVT_MASKED))
+			apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED);
+	}
+#endif
+
 	/*
 	 * Clean APIC state for other OSs:
 	 */
--
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