x86: nmi_32.c - add "panic" option

Allow to pass "panic" option in 32bit mode

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: hpa@zytor.com
Cc: mingo@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 10 insertions, 1 deletions

diff --git a/arch/x86/kernel/nmi_32.c b/arch/x86/kernel/nmi_32.c
index bd04a28f7a5c..4437fe1edabc 100644
--- a/arch/x86/kernel/nmi_32.c
+++ b/arch/x86/kernel/nmi_32.c
@@ -42,6 +42,7 @@ static cpumask_t backtrace_mask = CPU_MASK_NONE;
  *  0: the lapic NMI watchdog is disabled, but can be enabled
  */
 atomic_t nmi_active = ATOMIC_INIT(0);           /* oprofile uses this */
+static int panic_on_timeout;
 
 unsigned int nmi_watchdog = NMI_DEFAULT;
 static unsigned int nmi_hz = HZ;
@@ -140,6 +141,14 @@ static int __init setup_nmi_watchdog(char *str)
 {
         int nmi;
 
+        if (!strncmp(str, "panic", 5)) {
+                panic_on_timeout = 1;
+                str = strchr(str, ',');
+                if (!str)
+                        return 1;
+                ++str;
+        }
+
         get_option(&str, &nmi);
 
         if ((nmi >= NMI_INVALID) || (nmi < NMI_NONE))
@@ -374,7 +383,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
                          * die_nmi will return ONLY if NOTIFY_STOP happens..
                          */
                         die_nmi("BUG: NMI Watchdog detected LOCKUP",
-                                regs, 0);
+                                regs, panic_on_timeout);
         } else {
                 __get_cpu_var(last_irq_sum) = sum;
                 local_set(&__get_cpu_var(alert_counter), 0);