Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755251Ab0G3TGw (ORCPT ); Fri, 30 Jul 2010 15:06:52 -0400 Received: from kroah.org ([198.145.64.141]:51600 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757698Ab0G3RSk (ORCPT ); Fri, 30 Jul 2010 13:18:40 -0400 X-Mailbox-Line: From gregkh@clark.site Fri Jul 30 10:15:05 2010 Message-Id: <20100730171505.137469028@clark.site> User-Agent: quilt/0.48-11.2 Date: Fri, 30 Jul 2010 10:14:48 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Yinghai Lu , Suresh Siddha , "H. Peter Anvin" Subject: [060/165] x86: Fix x2apic preenabled system with kexec In-Reply-To: <20100730171550.GA1299@kroah.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2055 Lines: 59 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Yinghai Lu commit fd19dce7ac07973f700b0f13fb7f94b951414a4c upstream. Found one x2apic system kexec loop test failed when CONFIG_NMI_WATCHDOG=y (old) or CONFIG_LOCKUP_DETECTOR=y (current tip) first kernel can kexec second kernel, but second kernel can not kexec third one. it can be duplicated on another system with BIOS preenabled x2apic. First kernel can not kexec second kernel. It turns out, when kernel boot with pre-enabled x2apic, it will not execute disable_local_APIC on shutdown path. when init_apic_mappings() is called in setup_arch, it will skip setting of apic_phys when x2apic_mode is set. ( x2apic_mode is much early check_x2apic()) Then later, disable_local_APIC() will bail out early because !apic_phys. So check !x2apic_mode in x2apic_mode in disable_local_APIC with !apic_phys. another solution could be updating init_apic_mappings() to set apic_phys even for preenabled x2apic system. Actually even for x2apic system, that lapic address is mapped already in early stage. BTW: is there any x2apic preenabled system with apicid of boot cpu > 255? Signed-off-by: Yinghai Lu LKML-Reference: <4C3EB22B.3000701@kernel.org> Acked-by: Suresh Siddha Signed-off-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/apic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -941,7 +941,7 @@ void disable_local_APIC(void) unsigned int value; /* APIC hasn't been mapped yet */ - if (!apic_phys) + if (!x2apic_mode && !apic_phys) return; clear_local_APIC(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/