From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Thu, 15 Mar 2007 00:50:48 +0000 (-0700)
Subject: Disable NMI watchdog by default properly
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=8ce5e3e45e01ffab38a9f03900181132b9068543;p=openwrt%2Fstaging%2Fblogic.git

Disable NMI watchdog by default properly

This reverts commit 6ebf622b2577c50b1f496bd6a5e8739e55ae7b1c and
replaces it with one that actually works.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index 821df34d2b3a..14702427b104 100644
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -245,14 +245,6 @@ static int __init check_nmi_watchdog(void)
 	unsigned int *prev_nmi_count;
 	int cpu;
 
-	/* Enable NMI watchdog for newer systems.
-	   Probably safe on most older systems too, but let's be careful.
-	   IBM ThinkPads use INT10 inside SMM and that allows early NMI inside SMM
-	   which hangs the system. Disable watchdog for all thinkpads */
-	if (nmi_watchdog == NMI_DEFAULT && dmi_get_year(DMI_BIOS_DATE) >= 2004 &&
-		!dmi_name_in_vendors("ThinkPad"))
-		nmi_watchdog = NMI_LOCAL_APIC;
-
 	if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DEFAULT))
 		return 0;
 
diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c
index 486f4c61a948..82d9d85d5270 100644
--- a/arch/x86_64/kernel/nmi.c
+++ b/arch/x86_64/kernel/nmi.c
@@ -187,10 +187,7 @@ void nmi_watchdog_default(void)
 {
 	if (nmi_watchdog != NMI_DEFAULT)
 		return;
-	if (nmi_known_cpu())
-		nmi_watchdog = NMI_LOCAL_APIC;
-	else
-		nmi_watchdog = NMI_IO_APIC;
+	nmi_watchdog = NMI_NONE;
 }
 
 static int endflag __initdata = 0;
diff --git a/include/asm-i386/nmi.h b/include/asm-i386/nmi.h
index 64544cb85d6a..b04333ea6f31 100644
--- a/include/asm-i386/nmi.h
+++ b/include/asm-i386/nmi.h
@@ -33,7 +33,7 @@ extern int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason);
 
 extern atomic_t nmi_active;
 extern unsigned int nmi_watchdog;
-#define NMI_DEFAULT     0
+#define NMI_DEFAULT     -1
 #define NMI_NONE	0
 #define NMI_IO_APIC	1
 #define NMI_LOCAL_APIC	2
diff --git a/include/asm-x86_64/nmi.h b/include/asm-x86_64/nmi.h
index ceb3d8dac33d..72375e7d32a8 100644
--- a/include/asm-x86_64/nmi.h
+++ b/include/asm-x86_64/nmi.h
@@ -64,7 +64,7 @@ extern int setup_nmi_watchdog(char *);
 
 extern atomic_t nmi_active;
 extern unsigned int nmi_watchdog;
-#define NMI_DEFAULT	0
+#define NMI_DEFAULT	-1
 #define NMI_NONE	0
 #define NMI_IO_APIC	1
 #define NMI_LOCAL_APIC	2