cregit-Linux how code gets into the kernel

Release 4.7 kernel/backtracetest.c

Directory: kernel
/*
 * 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) { 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(); }

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vegard nossumvegard nossum1885.71%133.33%
fabian frederickfabian frederick29.52%133.33%
arjan van de venarjan van de ven14.76%133.33%
Total21100.00%3100.00%

static DECLARE_COMPLETION(backtrace_work);
static void backtrace_test_irq_callback(unsigned long data) { dump_stack(); complete(&backtrace_work); }

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vegard nossumvegard nossum1157.89%150.00%
arjan van de venarjan van de ven842.11%150.00%
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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); }

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vegard nossumvegard nossum2466.67%133.33%
arjan van de venarjan van de ven1027.78%133.33%
fabian frederickfabian frederick25.56%133.33%
Total36100.00%3100.00%

#ifdef CONFIG_STACKTRACE
static void backtrace_test_saved(void) { struct stack_trace trace; unsigned long entries[8]; pr_info("Testing a saved backtrace.\n"); pr_info("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); }

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vegard nossumvegard nossum6897.14%150.00%
fabian frederickfabian frederick22.86%150.00%
Total70100.00%2100.00%

#else
static void backtrace_test_saved(void) { pr_info("Saved backtrace test skipped.\n"); }

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fabian frederickfabian frederick17.69%150.00%
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#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; }

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arjan van de venarjan van de ven2273.33%125.00%
vegard nossumvegard nossum620.00%250.00%
fabian frederickfabian frederick26.67%125.00%
Total30100.00%4100.00%


static void exitf(void) { }

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module_init(backtrace_regression_test); module_exit(exitf); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");

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vegard nossumvegard nossum17366.80%250.00%
arjan van de venarjan van de ven7729.73%125.00%
fabian frederickfabian frederick93.47%125.00%
Total259100.00%4100.00%
Directory: kernel
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