Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / backtracetest.c

diff --git a/kernel/kernel/backtracetest.c b/kernel/kernel/backtracetest.c
new file mode 100644 (file)
index 0000000..1323360
--- /dev/null
+++ b/kernel/kernel/backtracetest.c
@@ -0,0 +1,91 @@
+/*
+ * 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();
+}
+
+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)
+{
+       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);
+}
+#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>");