From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 kernel/backtracetest.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 kernel/backtracetest.c

(limited to 'kernel/backtracetest.c')

diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c
new file mode 100644
index 000000000..370217dd7
--- /dev/null
+++ b/kernel/backtracetest.c
@@ -0,0 +1,82 @@
+// 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_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
+
+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>");
-- 
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