83 строки
1.9 KiB
C
83 строки
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Simple stack backtrace regression test module
|
|
*
|
|
* (C) Copyright 2008 Intel Corporation
|
|
* Author: Arjan van de Ven <arjan@linux.intel.com>
|
|
*/
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
|
|
static void backtrace_test_normal(void)
|
|
{
|
|
pr_info("Testing a backtrace from process context.\n");
|
|
pr_info("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
dump_stack();
|
|
}
|
|
|
|
static DECLARE_COMPLETION(backtrace_work);
|
|
|
|
static void backtrace_test_irq_callback(unsigned long data)
|
|
{
|
|
dump_stack();
|
|
complete(&backtrace_work);
|
|
}
|
|
|
|
static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
|
|
|
|
static void backtrace_test_irq(void)
|
|
{
|
|
pr_info("Testing a backtrace from irq context.\n");
|
|
pr_info("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
init_completion(&backtrace_work);
|
|
tasklet_schedule(&backtrace_tasklet);
|
|
wait_for_completion(&backtrace_work);
|
|
}
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
static void backtrace_test_saved(void)
|
|
{
|
|
unsigned long entries[8];
|
|
unsigned int nr_entries;
|
|
|
|
pr_info("Testing a saved backtrace.\n");
|
|
pr_info("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
|
|
stack_trace_print(entries, nr_entries, 0);
|
|
}
|
|
#else
|
|
static void backtrace_test_saved(void)
|
|
{
|
|
pr_info("Saved backtrace test skipped.\n");
|
|
}
|
|
#endif
|
|
|
|
static int backtrace_regression_test(void)
|
|
{
|
|
pr_info("====[ backtrace testing ]===========\n");
|
|
|
|
backtrace_test_normal();
|
|
backtrace_test_irq();
|
|
backtrace_test_saved();
|
|
|
|
pr_info("====[ 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>");
|