linux-kernel - [PATCH 1/5] x86: NMI watchdog: Downgrade helper

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Date:	Fri, 6 Jun 2008 03:27:41 +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>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] x86: NMI watchdog: Downgrade helper

 A downgrade helper for the NMI watchdog to be used in all places where 
the I/O APIC watchdog may have been requested, but the I/O APIC is found 
not to be there or meant to be left disabled.  This is so that the 
reconfiguration is cosistent and defined in a single place only.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
patch-2.6.26-rc1-20080505-nmiwd-local-0
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/include/asm-x86/nmi.h linux-2.6.26-rc1-20080505/include/asm-x86/nmi.h
--- linux-2.6.26-rc1-20080505.macro/include/asm-x86/nmi.h	2008-05-05 02:55:57.000000000 +0000
+++ linux-2.6.26-rc1-20080505/include/asm-x86/nmi.h	2008-06-05 19:56:30.000000000 +0000
@@ -78,6 +78,11 @@ extern int unknown_nmi_panic;
 void __trigger_all_cpu_backtrace(void);
 #define trigger_all_cpu_backtrace() __trigger_all_cpu_backtrace()
 
+static inline void localise_nmi_watchdog(void)
+{
+	if (nmi_watchdog == NMI_IO_APIC)
+		nmi_watchdog = NMI_LOCAL_APIC;
+}
 #endif
 
 void lapic_watchdog_stop(void);
--
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