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-rw-r--r--kernel/backtracetest.c65
-rw-r--r--kernel/stacktrace.c14
2 files changed, 62 insertions, 17 deletions
diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c
index d1a7605c5b8..a5e026bc45c 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;
}
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index b71816e47a3..94b527ef1d1 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -6,19 +6,21 @@
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include <linux/sched.h>
+#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
void print_stack_trace(struct stack_trace *trace, int spaces)
{
- int i, j;
+ int i;
- for (i = 0; i < trace->nr_entries; i++) {
- unsigned long ip = trace->entries[i];
+ if (WARN_ON(!trace->entries))
+ return;
- for (j = 0; j < spaces + 1; j++)
- printk(" ");
- print_ip_sym(ip);
+ for (i = 0; i < trace->nr_entries; i++) {
+ printk("%*c", 1 + spaces, ' ');
+ print_ip_sym(trace->entries[i]);
}
}
+EXPORT_SYMBOL_GPL(print_stack_trace);