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Message-ID: <20091103171016.GA25437@redhat.com>
Date: Tue, 3 Nov 2009 12:10:17 -0500
From: Aristeu Rozanski <aris@...hat.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] x86: add config option for the default NMI watchdog
This patch adds config options to allow selecting one of the two NMI watchdog
methods as default. It's still possible to select a different method or even
disable it using the command line mode. This is required for the next patch,
which adds support to "auto" mode.
Signed-off-by: Aristeu Rozanski <aris@...hat.com>
---
arch/x86/kernel/apic/nmi.c | 11 ++++++++++-
lib/Kconfig.debug | 21 +++++++++++++++++++++
2 files changed, 31 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/apic/nmi.c b/arch/x86/kernel/apic/nmi.c
index e82a450..fd176e9 100644
--- a/arch/x86/kernel/apic/nmi.c
+++ b/arch/x86/kernel/apic/nmi.c
@@ -50,7 +50,16 @@ static cpumask_var_t backtrace_mask;
atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
EXPORT_SYMBOL(nmi_active);
-unsigned int nmi_watchdog = NMI_NONE;
+#ifdef CONFIG_DEBUG_DEFAULT_NMI_NONE
+#define DEFAULT_NMI_WATCHDOG_VALUE NMI_NONE
+#endif
+#ifdef CONFIG_DEBUG_DEFAULT_NMI_IOAPIC
+#define DEFAULT_NMI_WATCHDOG_VALUE NMI_IOAPIC
+#endif
+#ifdef CONFIG_DEBUG_DEFAULT_NMI_LAPIC
+#define DEFAULT_NMI_WATCHDOG_VALUE NMI_LAPIC
+#endif
+unsigned int nmi_watchdog = DEFAULT_NMI_WATCHDOG_VALUE;
EXPORT_SYMBOL(nmi_watchdog);
static int panic_on_timeout;
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 2790b4f..0a3622a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -253,6 +253,27 @@ config DEBUG_NMI_TIMEOUT
This value is the number of seconds the NMI watchdog will tick
before it decides the machine has hung.
+choice
+ prompt "Default NMI watchdog method"
+ default DEBUG_DEFAULT_NMI_NONE
+ depends on X86
+ help
+ This allows to set the default NMI watchdog method to be used. The
+ default can be changed using nmi_watchdog=. Only choose an option
+ different from Disabled if you know the machine supports that method.
+
+config DEBUG_DEFAULT_NMI_NONE
+ bool "Disabled"
+
+config DEBUG_DEFAULT_NMI_IOAPIC
+ bool "IOAPIC"
+
+config DEBUG_DEFAULT_NMI_LAPIC
+ bool "LAPIC"
+
+endchoice
+
+
config TIMER_STATS
bool "Collect kernel timers statistics"
depends on DEBUG_KERNEL && PROC_FS
--
1.5.5.6
--
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