diff options
| author |   Arjan van de Ven <arjan@infradead.org> | 2008-01-30 13:33:08 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:08 +0100 |
| commit | 6dab27784b2a97823b522e1cb88e40be40a93d45 (patch) | |
| tree | 75ee27b4841aad5800531e591aed141164071727 | |
| parent | x86: use the stack frames to get exact stack-traces for CONFIG_FRAMEPOINTER on x86-64 (diff) | |
| download | linux-dev-6dab27784b2a97823b522e1cb88e40be40a93d45.tar.xz linux-dev-6dab27784b2a97823b522e1cb88e40be40a93d45.zip | |
x86: add a simple backtrace test module
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..
[ mingo@elte.hu: build fix ]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | kernel/Makefile | 1 | ||||
| -rw-r--r-- | kernel/backtracetest.c | 48 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 12 |
3 files changed, 61 insertions, 0 deletions
diff --git a/kernel/Makefile b/kernel/Makefile index 62015c3d8d91..8885627ea021 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_KALLSYMS) += kallsyms.o obj-$(CONFIG_PM) += power/ obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o obj-$(CONFIG_KEXEC) += kexec.o +obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o obj-$(CONFIG_COMPAT) += compat.o obj-$(CONFIG_CGROUPS) += cgroup.o obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c new file mode 100644 index 000000000000..d1a7605c5b8f --- /dev/null +++ b/kernel/backtracetest.c @@ -0,0 +1,48 @@ +/* + * Simple stack backtrace regression test module + * + * (C) Copyright 2008 Intel Corporation + * Author: Arjan van de Ven <arjan@linux.intel.com> + * + * 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> +#include <linux/delay.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 <arjan@linux.intel.com>"); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index f535b9b5eb00..aa56e631580d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -506,6 +506,18 @@ config KPROBES_SANITY_TEST 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 |