string: factorize skip_spaces and export it to be generally available

[safe/jmp/linux-2.6] / kernel / backtracetest.c

diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c
index d1a7605..a5e026b 100644 (file)
--- 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;
 }