From c51eff25b8c4b8115859dd7b5a4c11207540756c Mon Sep 17 00:00:00 2001
From: Richard Braun <rbraun@sceen.net>
Date: Sat, 13 Apr 2013 15:13:56 +0200
Subject: kern/panic: restrict handling to the first panic

Multiple panics occurring on different processors will usually produce
unhelpful traces. Also, the first is commonly the most important, often
being the same as the others, or more directly related to the root cause
of the problem.
---
 kern/panic.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'kern/panic.c')

diff --git a/kern/panic.c b/kern/panic.c
index f9c3f59e..bccf632b 100644
--- a/kern/panic.c
+++ b/kern/panic.c
@@ -19,13 +19,23 @@
 
 #include <kern/panic.h>
 #include <kern/printk.h>
+#include <machine/atomic.h>
 #include <machine/cpu.h>
 #include <machine/strace.h>
 
+static unsigned long panic_done;
+
 void
 panic(const char *format, ...)
 {
     va_list list;
+    unsigned long already_done;
+
+    already_done = atomic_swap(&panic_done, 1);
+
+    if (already_done)
+        for (;;)
+            cpu_idle();
 
     cpu_intr_disable();
     cpu_halt_broadcast();
-- 
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