1 files changed, 54 insertions, 11 deletions

diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c
index d1a7605c5b8f..a5e026bc45c4 100644
--- a/kernel/backtracetest.c
+++ b/kernel/backtracetest.c
@@ -10,30 +10,73 @@
  * 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/delay.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");
 
-static struct timer_list backtrace_timer;
+        dump_stack();
+}
 
-static void backtrace_test_timer(unsigned long data)
+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");
-        dump_stack();
+
+        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");
-        printk("Testing a backtrace from process context.\n");
-        printk("The following trace is a kernel self test and not a bug!\n");
-        dump_stack();
 
-        init_timer(&backtrace_timer);
-        backtrace_timer.function = backtrace_test_timer;
-        mod_timer(&backtrace_timer, jiffies + 10);
+        backtrace_test_normal();
+        backtrace_test_irq();
+        backtrace_test_saved();
 
-        msleep(10);
         printk("====[ end of backtrace testing ]====\n");
         return 0;
 }