From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762375AbZANM2Z (ORCPT ); Wed, 14 Jan 2009 07:28:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753425AbZANM2R (ORCPT ); Wed, 14 Jan 2009 07:28:17 -0500 Received: from vpn.id2.novell.com ([195.33.99.129]:52772 "EHLO vpn.id2.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751605AbZANM2Q convert rfc822-to-8bit (ORCPT ); Wed, 14 Jan 2009 07:28:16 -0500 Message-Id: <496DE893.76E4.0078.0@novell.com> X-Mailer: Novell GroupWise Internet Agent 8.0.0 Date: Wed, 14 Jan 2009 12:28:51 +0000 From: "Jan Beulich" To: , , Cc: Subject: [PATCH] x86: avoid early crash in disable_local_APIC() Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org E.g. when called due to an early panic. Signed-off-by: Jan Beulich --- 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(); /*