linux-kernel - [PATCH] x86: avoid early crash in disable_local

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Date:	Wed, 14 Jan 2009 12:28:51 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: avoid early crash in disable_local_APIC()

E.g. when called due to an early panic.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 arch/x86/kernel/apic.c |    4 ++++
 1 file changed, 4 insertions(+)

--- linux-2.6.29-rc1/arch/x86/kernel/apic.c	2009-01-14 11:36:05.000000000 +0100
+++ 2.6.29-rc1-x86-early-disable-lapic/arch/x86/kernel/apic.c	2009-01-06 16:51:35.000000000 +0100
@@ -894,6 +894,10 @@ void disable_local_APIC(void)
 {
 	unsigned int value;
 
+	/* APIC hasn't been mapped yet */
+	if (!apic_phys)
+		return;
+
 	clear_local_APIC();
 
 	/*



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