Add a simple backtrace test module

From:		Arjan van de Ven
To:		[e-mail]
Subject:		[patch] Add a simple backtrace test module
Date:		Wed, 9 Jan 2008 22:42:08 -0800
Message-ID:		<[e-mail]>
Cc:		[e-mail]

Subject: Add a simple backtrace test module
From: Arjan van de Ven

During the work on the x86 32 and 64 bit backtrace code I found it useful
to have a simple test module to test a process and irq context backtrace.
Since the existing backtrace code was buggy, I figure it might be useful
to have such a test module in the kernel so that maybe we can even
detect such bugs earlier..

Signed-off-by: Arjan van de Ven

---
 kernel/Makefile        |    1 +
 kernel/backtracetest.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 lib/Kconfig.debug      |   12 ++++++++++++
 3 files changed, 60 insertions(+)

Index: linux-2.6.24-rc7/kernel/Makefile
===================================================================
--- linux-2.6.24-rc7.orig/kernel/Makefile
+++ linux-2.6.24-rc7/kernel/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_DETECT_SOFTLOCKUP) += softl
 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
+obj-$(BACKTRACE_SELF_TEST) += backtracetest.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
Index: linux-2.6.24-rc7/kernel/backtracetest.c
===================================================================
--- /dev/null
+++ linux-2.6.24-rc7/kernel/backtracetest.c
@@ -0,0 +1,47 @@
+/*
+ * Simple stack backtrace regression test module
+ *
+ * (C) Copyright 2008 Intel Corporation
+ * Author: Arjan van de Ven
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+
+static struct timer_list backtrace_timer;
+
+static void backtrace_test_timer(unsigned long data)
+{
+    printk("Testing a backtrace from irq context.\n");
+    printk("The following trace is a kernel self test and not a bug!\n");
+    dump_stack();
+}
+static int backtrace_regression_test(void)
+{
+    printk("====[ backtrace testing ]===========\n");
+    printk("Testing a backtrace from process context.\n");
+    printk("The following trace is a kernel self test and not a bug!\n");
+    dump_stack();
+
+    init_timer(&backtrace_timer);
+    backtrace_timer.function = backtrace_test_timer;
+    mod_timer(&backtrace_timer, jiffies + 10);
+
+    msleep(10);
+    printk("====[ end of backtrace testing ]====\n");
+    return 0;
+}
+
+static void exitf(void)
+{
+}
+
+module_init(backtrace_regression_test);
+module_exit(exitf);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arjan van de Ven ");
Index: linux-2.6.24-rc7/lib/Kconfig.debug
===================================================================
--- linux-2.6.24-rc7.orig/lib/Kconfig.debug
+++ linux-2.6.24-rc7/lib/Kconfig.debug
@@ -462,6 +462,18 @@ config RCU_TORTURE_TEST
       Say M if you want the RCU torture tests to build as a module.
       Say N if you are unsure.

+config BACKTRACE_SELF_TEST
+    tristate "Self test for the backtrace code"
+    depends on DEBUG_KERNEL
+    default n
+    help
+      This option provides a kernel module that can be used to test
+      the kernel stack backtrace code. This option is not useful
+      for distributions or general kernels, but only for kernel
+      developers working on architecture code.
+
+      Say N if you are unsure.
+
 config LKDTM
     tristate "Linux Kernel Dump Test Tool Module"
     depends on DEBUG_KERNEL

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