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| author | Andi Kleen <ak@suse.de> | 2006-10-21 18:37:02 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-10-21 18:37:02 +0200 |
| commit | a1bae67243512ca30ceda48e3e24e25b543f8ab7 (patch) | |
| tree | 9f90a2a4ac04ecd7e23c0049570cd570b6ae37ee /arch | |
| parent | 581910e2eb952e541b8ca9b5f551d6c124903b61 (diff) | |
| download | linux-stable-a1bae67243512ca30ceda48e3e24e25b543f8ab7.tar.gz linux-stable-a1bae67243512ca30ceda48e3e24e25b543f8ab7.tar.bz2 linux-stable-a1bae67243512ca30ceda48e3e24e25b543f8ab7.zip | |
[PATCH] i386: Disable nmi watchdog on all ThinkPads
Even newer Thinkpads have bugs in SMM code that causes hangs with
NMI watchdog.
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/nmi.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index 3e8e3adb0489..eaafe233a5da 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -219,11 +219,11 @@ static int __init check_nmi_watchdog(void) int cpu; /* Enable NMI watchdog for newer systems. - Actually it should be safe for most systems before 2004 too except - for some IBM systems that corrupt registers when NMI happens - during SMM. Unfortunately we don't have more exact information - on these and use this coarse check. */ - if (nmi_watchdog == NMI_DEFAULT && dmi_get_year(DMI_BIOS_DATE) >= 2004) + 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)) |