linux-kernel - [PATCH 6/8] x86: APIC/SMP: Downgrade the NMI watchdog for "nosmp"

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Message-ID: <Pine.LNX.4.55.0805212035540.4894@cliff.in.clinika.pl>
Date:	Wed, 21 May 2008 22:10:16 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 6/8] x86: APIC/SMP: Downgrade the NMI watchdog for "nosmp"

 If configured to use the I/O APIC, the NMI watchdog is deemed to fail if 
the chip has been deactivated as a result of "nosmp".  Downgrade to the 
local APIC watchdog similarly to what is done for the UP case.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
patch-2.6.26-rc1-20080505-nosmp-watchdog-0
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/smpboot.c linux-2.6.26-rc1-20080505/arch/x86/kernel/smpboot.c
--- linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/smpboot.c	2008-05-21 06:24:25.000000000 +0000
+++ linux-2.6.26-rc1-20080505/arch/x86/kernel/smpboot.c	2008-05-21 06:24:25.000000000 +0000
@@ -1147,6 +1147,10 @@ static int __init smp_sanity_check(unsig
 	if (!max_cpus) {
 		printk(KERN_INFO "SMP mode deactivated.\n");
 		smpboot_clear_io_apic();
+
+		if (nmi_watchdog != NMI_NONE && nmi_watchdog != NMI_DISABLED)
+			nmi_watchdog = NMI_LOCAL_APIC;
+
 #ifdef CONFIG_X86_32
 		connect_bsp_APIC();
 #endif
--
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