mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 22:53:55 +08:00
4e6a0535dd
On qemu, the backtrace would show up _after_ the "end of backtrace testing" message. This patch changes it to use completions instead, which will guarantee that no such race exists. Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/*
|
|
* 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/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)
|
|
{
|
|
printk("Testing a backtrace from process context.\n");
|
|
printk("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)
|
|
{
|
|
printk("Testing a backtrace from irq context.\n");
|
|
printk("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)
|
|
{
|
|
struct stack_trace trace;
|
|
unsigned long entries[8];
|
|
|
|
printk("Testing a saved backtrace.\n");
|
|
printk("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
trace.nr_entries = 0;
|
|
trace.max_entries = ARRAY_SIZE(entries);
|
|
trace.entries = entries;
|
|
trace.skip = 0;
|
|
|
|
save_stack_trace(&trace);
|
|
print_stack_trace(&trace, 0);
|
|
}
|
|
#else
|
|
static void backtrace_test_saved(void)
|
|
{
|
|
printk("Saved backtrace test skipped.\n");
|
|
}
|
|
#endif
|
|
|
|
static int backtrace_regression_test(void)
|
|
{
|
|
printk("====[ backtrace testing ]===========\n");
|
|
|
|
backtrace_test_normal();
|
|
backtrace_test_irq();
|
|
backtrace_test_saved();
|
|
|
|
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>");
|